accidentally grabbed club soda instead of tonic (damn you kroger for making them slightly different shades of blue). club soda makes shitty gin and tonic. no matter how much gin or lime, it tastes like club soda. this double wont be worth it for another 20 minutes.
Addendum protip from CPK's lesson: Make them strong enough to where you can taste the vodka. Tasting the vodka reminds you to pace yourself. He said he made them where he couldn't taste it the first year and ended up shithoused way too early.