Bottle feeding question

FTM here and was looking into buying these already made formula bottles. 2 stupid question 1. Do I have to change the nipple for each bottle? ( was planning on washing it after use) but i guess its better to just buy several nipples? 2. Could I just pour this into a different bottle I want to use? I recently bought those nano bebe bottles and wanted to breast feed but as a ftm i doubt my milk supply will be good right away. No leakage or anything & Im 37 weekw...(nano nipple is good for breast feeding) pics below TIA!