Is there a tear in your beer? Next time avoid an accidental IPA salting with the Cooler Torch, an LED-underlit drink koozie. Torch sleeves look like standard drink holders, and fit the same litany of cans and bottles (baby included!), but have a heavier base with the built-in tech to set your libations aglow. The Cooler Torch's 9 LEDs are also multi-colored so you can choose from a white, green, or red rave in a bottle.
Though the light-up koozies obviously achieve their best effects under transparent containers, their glow will still spill out the neoprene sides and through cracks for easy location when holding those that are opaque.