If you want to try intermittent fasting just eat for 6-8 hours a day

If you want to just drink water, note that you are not getting enough calories. You also aren't getting enough nutrients and minerals. For the love of all that is holy, eat a multivitamin.

And don't do this crap for more than a day. During the weekend I can consume as little as 1000 calories because I will only eat one, two meals max. but that's nothing compared to just drinking water.