Takes practice. A few local friends prefer CamelBak backpacks for water in warm weather, even for casual rides around 10-12 mph. I see a few roadies in faster groups wearing CamelBaks too, although most use water bottles. But they need to stop to refill, while the folks with CamelBaks can go all day.
Do what works for you.
When I resumed cycling in 2015 after a 30 year hiatus, it took me awhile to regain confidence in balance to drink while riding without fumbling the bottle and veering offline. Same problem when I got an old school road bike with downtube shifters in 2017. Now I'm very comfortable with all of it, but it took awhile.