P was 8mo when I went back to work 3 days per week. She was fed to sleep for day naps and fed at least once a night. She was mostly looked after by my mum, but I put her into care about a month later 1 day per week.
I always packed a bottle for her to have prior to her nap/s, but apparently she rarely drank anything much from it. I liked it to be there though, just in case she wanted that to help her settle for a sleep. Mainly she grew used to drinking water through the day and settling for a sleep with cuddles instead. Then she'd have a big feed when I picked her up.
I'm going to say, chill out - it's still 8 weeks away. Enjoy these 8 weeks and try not to worry about what comes next.