I've used Drip Drop a few years ago, as well as all the other ORS formulations, but for the amount of ORS I drink I've found that making my own is the only way to go. I also make my own when I eat out, as once you know the ratio it's simple. I get lots of strange looks from folks when they see me adding a few salt packets to my soda cup. The best thing to happen recently is the introduction of those countertop Coke product dispensers at the fast food places. With those you have almost unlimited flavors to choose from and it also has unflavored seltzer that's necessary to knock down the sweetness of most Coke products. I use a lot of seltzer in my ORS, so I'm looking into a SodaStream type of carbon dioxide supplier instead of humping 2-liter bottles of seltzer home from the supermarket every week.
Year before last I worked with Enterade on their ORS, but that works on a different principle of absorption than the osmolarity theory of the ORS you're talking about. The Enterade is stupid expensive (as it's marketed to cancer patients and sold as "medical food")......and it taste's absolutely horrible.
With all the experimenting I've done with ORS I've found that with SBS folks timing is almost more important than osmolarity. I've spoken to a number of SBS "experts" about this, but they either don't believe me or don't care......take your pick. I was working on the assumption that there's a "cyclic" nature to absorption, and I haven't abandoned that idea yet, but now I'm experimenting (and having a lot of success with) the idea of hydrating when my intestines are mostly empty. You can try this yourself easy enough. Make sure to stop eating by midnight. Then don't eat or drink anything until 3:30am, at which time you start sipping on a quart/litre of your favorite ORS and finish it by 4:30am. If you have any output it will be any residual food that was in your bowels before you started drinking your ORS. You'll be amazed as you sit there past 4:30am and none of the ORS comes out......it all gets absorbed. I think it can do this because during the day your interior intestine real estate is covered with food particles, so there's no room for liquid to get to the semi-permiable wall membrane. Late in the AM the intestinal walls are uncovered and osmosis can take place.
I could certainly be wrong, but anecdotally.........since my ostomy in 2014 I couldn't get my weight over 180 lbs no matter what I tried, and it mostly bounced between 175 and 180. I started doing the 3:30am hydration a couple weeks ago (before that I started drinking earlier), and I weighed 191 lbs yesterday without any bouncing.....just a steady increase every day.. I won't argue with success. Bottom line to all this is that there's still a lot they don't understand about how the bowels work, and there's not enough of us SBSers to justify the research resources......so we're on our own. Hang in there.......I'll figure this out eventually.