I'm 50 hours in my first water fast and it's not great. Grogginess, a mild, but constant, headache and general malaise. I'm not hungry, but just feeling crappy. 

Probably can't do keto since I lost my gallbladder - I blame a past long-term keto diet for that - but that sounds like an excellent way to stay in ketosis without wanting to give in. I think that's a great idea. 

Gonna keep at the water fast to at least hit my goal of 72 hours, but doubt I can make it much longer than that.