They have a 8 sample pack on AMZ. Of the 5 that I've tried the Watermelon and Raspberry taste the best. I'm not really a huge fan of Raspberries in general but the Raspberry seems especially accurate flavor wise to me and tastes good. Kind of reminds me of Berry flavored Propel.

Top Tier :

Watermelon - I'm naturally a watermelon fan for a lot of different things. Actually Kind of reminds me of the Sour Patch Watermelon candy.
Raspberry

Mid :

Orange - Didn't have much or enough orange taste that really made an impression but didn't taste bad either.
Grapefruit - I'm fan of grapefruit and this one didn't really do anything for me. Wasn't awful or anything but just didn't give me the grapefruit flavor I wanted.
Citrus - Tasted like a lemon / lime electrolyte drink but didn't impress me like Watermelon and Raspberry. I could see other people putting it in a higher tier though.
Chocolate - Surprisingly didn't taste bad. Was really surprised on this flavor.

Bottom :
- Mango Chili - Dunno how to explain it. It's drinkable but not something I'd want to drink if I had to choose.

Also have Unflavored to try but I imagine that'll just taste like salt because there's just Salt, Magnesium Malate , and Potassium Chloride in it.