OK, how many people here have had actual 2020 experiences with kids' meals and specialty beverages? In the previous posts, I see calls to Disney to discus with a CM and I see quotations from Disney webpages, but not *experiences*.
So, here's mine from Jan 1-8, 2020: We were always able to get a specialty beverage. I didn't want my kids drinking pop, so I was happy for a drink with Powerade, because yes, sugar, but some ingredients to keep them hydrated in the parks. At Woody's, they got root-beer floats.
Our party was four Disney adults and two kids, but my 12yo sometimes wanted something off the kid menu, like at Docking Bay 7. At our TS character meals (the only kind of TS we did), wait staff clearly said they would give him an adult portion of a children's item. At a couple QS places, he ordered a kid's meal...and they took off a QS kid's credit, not an adult one. (He was served the kid's portion, to be clear.)
So, unfortunately, I think restaurant to restaurant, CM to CM, I think you'll probably find variation, especially if you're going pretty soon in February before everyone is up to speed. Just always ask rather than assume you can not. I wondered if sometimes they took kid credits because it was easier than plugging in a kid item for an adult credit. I wondered if they didn't really look to see that our party was 4A 2C, or thought my 12yo might be a Disney kid on a casual glance at our party of three people over 5'8" tall (including our 6'1" 15yo) and three people 5' and under. So, some places' registers might not have strict controls over what drinks a dining-plan kid's meal can have and some might.
I know this would be hard to read when you're trying to plan your meals or choose whether or not to do a dining plan at all, but it might reflect what the situation really will be when you're ordering.