Most of them seem to drink soda here; in fact, we have a Mormon-owned soda shop in town that a lot of the school-age Mormon kids seem to hang out at! I've been told it's often a regional thing, that they're less "Mormon-y" (their term, not mine) if there's a community of them in the area. I suppose it's probably like any other group, and they feel less like outsiders.
Kinda interesting being somewhat immersed in what's effectively a conservative subculture that's supposed to not shun folks who aren't part of it. We have some weird conversations.