First of all NEVER leave any dog without water EVER.This is just cruel because we arent the ones to say if they do or dont need a drink.It doesnt have to be hot for them to be thirsty,neither must they ONLY drink after a long walk..water should be avalable 24/7,taking their water away for YOUR comfort is cruel,any vet will tell you this.The food schedule could work for you though.Good luck!