Batgirls #16 Cover B David Marquez Card Stock Variant

The Batgirls fall down a rabbit hole of mischief and wonder in their journey to find out who sent Cluemaster to kidnap his own daughter, Steph. But first, there's a bottle that says "Drink me," and it should be perfectly safe to drink, right? Even if it looks like it's been laced with Langstrom serum?