I have an "office" job, but I also have land that I cultivate and from which I obtain almonds, tangerines, grapes, olives, onions, melons and barbary figs. I get eggs from a neighbor.
It's enough to work Saturday and Sunday afternoons. Can be combined with normal job.
I also collect rainwater through a... cistern? It's like this:

But mine is bigger.
The field is about half an hour's drive from my house more or less.
But I don't see it viable to live of the field. They pay very little and you need large tracts of land with machinery for it.
Also you still depend on being in the system to sell and buy things, when the time comes they can cut you off, and also the police can come at any time if you are out of the system.
This can serve to survive if there is a famine or they don't let me buy food, but if there is an open persecution I won't escape martyrdom