Feeding woes. Sana may makasagot.

My baby is one week old. Inverted nipples ko kaya hirap syang maglatch. Super hirap talaga for him so we decided to feed him formula. Tanong ko lang po: 1. Anong klaseng tubig ba ang dapat gamitin sa pagtimpla? 2. Should it (water na gagamitin) be lukewarm or okay lang room temperature? 3. What are some good formula milk brands? Again, my baby is only a week old. Struggling FTM here. Many many thanks po sa makakasagot. ?