I mainly see only small containers to carry holy water in, and since I can only see a priest every so often, I was wondering what would be an appropriate container for it. Do they sell them somewhere special for this cause?

Do you drink wine?  The Carlo Rossi brand sells their wine in large glass wine jugs, wash them out, remove the label, and they are a nice looking clear glass jug, perfect for holy water.

https://www.carlorossi.com

I mainly see only small containers to carry holy water in, and since I can only see a priest every so often, I was wondering what would be an appropriate container for it. Do they sell them somewhere special for this cause?

Any clean container will work.

As a boy, I assisted as the priest blessed water in all types of containers, from gallon jugs of distilled water to 5 gallon buckets to plastic 40 gallon garbage cans filled with water and everything in between.

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A little-known survivalist trick is that if you have about 1 gallon of Holy Water, you can maintain a gallon net available for use INDEFINITELY, by using the following technique:  

Get a second container, like a 3/4 gallon, if you will, or else just another gallon jug, and pour about 40 ounces of Holy Water into it.  That's 1 quart, 8 ounces.  It's more than a quart (a quart is half of a half gallon), and it leaves more than a half gallon in the source jug.  

Then fill the source jug up with fresh unblessed water, giving you a full gallon of Holy Water.  The rule is, you can dilute Holy Water so long as more than 50% of the mix is composed of Holy Water, and you then have 100% Holy Water in the source gallon.  If you are worried about the exorcism prayers, so long as you are confirmed, you have the power of minor exorcism such as for water.  Not exorcisms for people.  So get a prayer book with exorcism for water and use it on the water that you will ADD to the Holy Water.  Do not use this prayer on the Holy Water, because it's already exorcised and blessed.  

Also with the smaller jug containing 40 oz. of Holy Water, you can add to that, up to like 32 ounces or a quart, of your fresh water (which you have prayed an exorcism over, if you wish).  BE CAREFUL NOT TO FILL THE GALLON JUG because then you will have added MORE than the volume of the Holy Water.  If you do it correctly, the result will be a mix of mostly Holy Water with a bit less of fresh unblessed water, giving you a little more than a half gallon (72oz.) of Holy Water.  

Go ahead and use this smaller jug of Holy Water, until you're running out of it, and then repeat this process by pouring out from the full gallon jug, and so on.  

So long as you mix MOSTLY Holy Water with a lesser amount of clean water, your mix will be all Holy Water.  If you make a mistake and mix mostly new water with a lesser amount of Holy Water, you still have Holy Water, but it's no longer capable of regenerating new Holy Water as above.  It will be diluted but still pretty much effective.  This is why you should always be most careful with your source jug, and never pour out more than about one third of it (42 oz.), so that you can top it off with a lesser volume of fresh (exorcised) water, and thus always maintain a full gallon of Holy Water.

Obviously, you can increase the scale of this by using 2 or 3 gallon jugs or even 5 gallon jugs.  Modern 5 gallon jugs might be hard to tell where the halfway volume line is, so you can find that by using a 3-gallon jug, and marking a guess of 2-1/2 gallons on it.  Fill it up to that line and pour into the 5-gallon jug two of those volumes, to check that it is truly enough to fill the 5 gal. jug.  If it's too much, then adjust your 2-1/2 gallon mark and try it again, etc.  Once you find the correct volume for 2-1/2 gallons, use that to half fill the 5-gal. jug, and MARK THAT LEVEL on the outside of the 5-gal. container.  That will then be the line that you never want to go below when you're going to refill it with exorcised fresh water.  If your mark is a little too high, that's not a problem, but if it's too low, that's no good, because you might end up with not enough Holy Water to mix in the future.  If that happens, don't worry, but just do not pour in to fill the jug to the top.  Only fill it halfway to the top, or 3/4 full, and let it set that way for a while.  Maybe pray a Rosary or some other prayers, or go to Mass.  Then later, come back and fill the jug the rest of the way.

It's a good idea to add a pinch of salt to newly mixed Holy Water.  Just a few grains is sufficient.  But it should be BLESSED SALT!  Speaking of which, I don't know about replenishing that.  Perhaps the same procedure applies.

If you don't like this idea, then don't do it.  I'm just telling about this in case you are in a survival situation, so you can then do the best with what you've got.  The time may come when we need to have tricks like this to preserve our Faith and our supplies.  There may soon come a time when Holy Water may become more precious than, well, a lot of other things.

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Thank you all for your ideas.

You're welcome.

I don't have any Paisano glass jugs , but they look nice.

I was under the impression that you could only dilute the holy water once.

I had heard that too, but then I was able to ask a theologian about it, and he assured me that so long as you start with more than half of your consequent volume in Holy Water, the result will be all holy water, and it can be repeated.

Another priest told me that the holy water blessed on Holy Saturday with all the elaborate ceremony is the most powerful for use against the devil.  I didn't ask him about diluting it.  The thing that's different about that water is the ceremony includes an exorcism.  Many times when a priest blesses holy water he skips the exorcism because it takes more time.  That might make a big difference.  

As for the Paisano jugs, they might not have a seam, which would make them extra nice for long term, looking like blown glass.  Apple cider jugs usually have a seam in the glass, so there's a left half and a right half.  

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LOL.  I know an old Traditonal priest who used an empty gabage pail .. during the Holy Saturday ceremony no less.