Make it too strong for her

The easiest plan is to use one of your bottles of vodka to make the jungle juice too nasty for Tori to drink. Plus, you're less likely to draw attention adding to the jungle juice than you are diluting it.

You successfully sneak your way into the kitchen. There's no one in there, but you still try to act casual in case any other party guests come in to grab a drink. You quickly out the bottles of vodka, then take one and start pouring it in to the bowl of jungle juice. You are almost home free when a guy walks in to the kitchen and spots you.

"Dude, what're you doing? I don't think jungle juice calls for a bottle of vodka, bro," the stranger says, suspicious of your behavior.

This isn't game over just yet. You can talk your way out of this. You just have to play it cool act like what you're doing is normal.