Plans of underground year-round shelter. Looking for advice.

#1. What would you do for full guaranteed waterproofing/bug proofing all the walls and roofs?

#2. How would you go about making an underground garden? Mainly referring to natural light.

#3. How would you collect water?

#4. how do you shower?

#5. Preferred method of tool upkeep and management as well as hunting materials?

(Yes I want this to be a fully self sufficient shelter)