rubber nipples

Kendall • 3 year old 👦🏼 • 🌈 coming 4/20 •
My 6 week old doesn't like th plastic nipples on his bottles. I only give him a bottle like once a day but he hates it. My mom suggested trying the playtex drop-ins with the rubber nipple but the discountinued them. Any suggestions what I should try. I need him to start taking a bottle without problems for when I go back to work in 6 weeks.