No-Till Setup Queation?

I setting up an indoor no-till garden. I'll be using 15 gallon fabric pots. Also, RO watering. So
how much water do it take per pot? It will help immensely so I can plan how much water to buy.

if you are going no till I would (and DO) use SIPs 15 gallon inntainer sounds right up your alley! Search for the SIP thread and there is a ton of info on them.