Formula Feeding Tips?

After 9 months of researching breast feeding & pumping I’ve come to the difficult decision to formula feed for the best interest of me and my son. Not to go into much detail but I have Bipolar & PTSD and as you can guess all my routine medications are not safe during pregnancy or breastfeeding (I feel blessed to have made it 9 months with a low dose antidepressant but feel I need to resume my normal treatment after delivery) ANYWAYS do you boil your water, use tap water, distilled water, brita pitcher? Any tips and advice is helpful. Thank you.