Sounds like an awesome opportunity! Sounds like there is a lot to work out. My only experience with community gardens is what my local Master Gardeners are currently doing. I suggest you start there as they will have more of an idea about how much space it takes to feed a family but keep in mind you can grow much more densely in hydro and it will not take as much space as traditional gardening.
There are lots of ideas floating a round to keep hydro cheap; you don't have to purchase a big elaborate systems. You can repurpose items to build easy, functional systems like barrels, pipes, totes, storage containers, kiddie pools and even bathtubs.
Check out YouTube and members pictures to get some great ideas!
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