Straw cups

Hello; I have a soon to be 14 month old. At our 1 year check up the pediatrician wanted us to try sippy as a goal but the dentist is telling me they will tell us to switch to straw cups at 15 months, I felt like I’ve tried everything (modeling, crying it out, and a couple of different brands) but nothing has worked 😖 what did you mommas do to get your little one sipping from a straw cup?