Advice: if it's lemonade, spike it with piss. If it's sour cream, spike it with cum. if it's hawaiian punch, however, just spike it with laxatives, adds extra flavor to something already great.
/j for whoever sees this and is gullible enough to take it as real advice

Ketchup can be laced with blood. Same goes for salsa dip. And what works for sour cream also works with mayonnaise if you mix it well.