My wife and I have been using this 'new' (to us) product... Ultima. Search Ultima Replenisher and it will come up. We get it from amazon. Usual disclaimer.

https://www.amazon.com/Ultima-Hydrating-Electrolyte-Raspberry-Gluten-Free/dp/B01IIGVUQA

We LOVE it!!! they have a bulk container and they have packets. It is GOOD stuff. I got tired of all the sugar in the commercial stuff and how many calories I was taking in....

It's packaging is really good. One packet/bottle. (Or one scoop). We get the raspberry. Haven't tried others yet. Even our sons will drink it and they don't like this type of stuff. Really good to have on hand. Hoping this helps someone.