nhardy, where are you located? If you put your zone location on your profile this would help us help you.
I live in 100+ degree heat in a long, long dry summers always, but my in-ground and container plants are on a drip system. My soil mix drains well, but retains water, so once every other day for the containers is fine. Depends. Blueberries need water as much as grapevines, so they are on that drip system.
Good luck to you!
Suzi