Feed will last four days and water nipple system will make a gallon of water go two weeks with grass. Friends always ask to watch my chickens and kids play with them (the only rule is the coop is a safe zone, no chasing inside the coop) and I always give the attending all eggs.
I jumped in with six pullets (city code) and no coop. It takes several weeks before they can go out so mine stayed in the basement in a box with little mess. Moved to the garage when they got chatty. Coops are available prebuilt if you need time to build a big one. Get a chick feeder and chick...