Dr. Gibs

Dr. Gibs is a beverage shown in the episode iBalls. Marty (Spencer's personal assistant) sets out three fresh plums, a napkin, and a bottle of Dr. Gibs for Spencer.

It is most likely a soda as it appears to be a parody of Dr Pepper. This may have also been a reference to Gibby, as he was shown shortly after Marty gave the drink to Spencer.