エナジースティック - コズミックスターダスト

These things dissolve clean in my water bottle with no weird residue, and 200mg of caffeine gets me through that brutal 3pm slump without the sugar crash. The zero sugar part is the real winner for me since I'm watching my intake.

Tossed these in my carry-on for a flight and they dissolved completely in cold water without any clumping—the zero sugar is a bonus since most drink mixes are way too sweet for me. Definitely keeps me alert through the afternoon slump.

I mix a packet into my water bottle before morning workouts, and that 200mg of caffeine hits smooth without any jitters. The fact that there's zero sugar makes it a no-brainer for me.