Do you recommend any carbonator devices?
Yes, get a DrinkMate. You can attach a CO2 hose from a tank to the fitment on the back of the DrinkMate. Get a 20lb+ tank to save cash. The DrinkMate uses proprietary water bottles but you can 3D print an adapter for whatever metal bottle you like or for plain old 5 gallon jugs. Look online for the hose fitment setups, there are tons of tutorials on this. Experiment with flavoring your water, but honestly I prefer rainwater through this.
As for water... Make a 2 stage water filter IMO since you live in the city have a flouride stage and a general filtration stage and get some filters for both. Buy 3 5-gallon buckets and you should be set, maybe get a little tap from a hardware store if you wanna be fancy. Just drill holes that will fit your chosen filters and you are set. Easy, cheap way to escape the municipal water trap.
Have you thought about collecting rainwater? Even in an apartment setup you can do this, well worth it.