Well right now I'm working my way to two weeks, but if things keep going as well as they are now, then I am going to go for 40 days.
Q 1. It depends on some factors. If you are ill or pregnant and have some other conditions like heart problems you problem shouldn't fast for 40 days and definetly not on just water.
Q 2. I personally am doing just water this time around. Last fast which was two weeks I did water and juice.