
I think you will do more harm than good restricting your pups access to drinking water. A healthy puppy who does not have such a restriction on it will develop normally, and in time will be house trained. I really cannot believe anybody would reccomend such a restriction. I feel sure that such a restriction may contribute to health problems.
I think it might be better to make sure that every time your puppy wakes up during the day and immediately after each meal is put outside, you should go with it and when it has been clean, you give it lots of praise. During the night it can be either put into a cage with water as a puppy will be reluctant to soil it's bed, or you could do what I do, which is get up during the night to let it out. Many people are very successful with training as they get the puppy used to going on newspapers, then as the puppy grows older the paper is moved out the door.
I really do not think you should be restricting your pups access to water at any time during the day or the night.