Since
Phenibut is extremely bitter, I've found that Crystal Light Lemonade goes really well with it. You can actually take your time drinking it. I've tried hot coffee, which was a big mistake. Orange juice, and
other juice flavors like fruit punch, raspberry, iced tea, etc... all don't seem to do the job like lemonade.
Just a friendly tip. You can also mix in
Piracetam (another bitter nootropic) and the Lemonade will cover it up really well.