Any and all advice appreciated!

I am planning to start water fasting until the end of Lent and would love any advice and words of encouragement!

The most I have done is a 5 day water fast and by the end of it I felt great. Since then I’ve done rolling 72’s!

I was wondering if taking a fiber supplement would be ideal? Also, besides electrolytes what else do I need to be prepared for?

31(F), 159lbs!

Thank you in advance!