How much water should a grey hound drink per day?

typically dogs drink when they are thirsty and there should be a correlation with food i think

open feeding water after meals (just put bowl of water down) should cause the dog to drink an appropriate amount of water unless something is wrong

Sometimes dogs will urinate in the house if they are allowed to open feed water so the best plan is to get dog on a good food schedule. I like 2x a day feeding with open water (they can drink anytime)