You wouldn't think that a single gallon of milk on the Costco shelves would be a big deal, but it recently sent a slew of Redditors into a full-blown tizzy.

If a recipe calls for 1 cup of cow's milk, you can replace it with lactose-free cow's milk or rice or soy milk. Just remember: Rice milk is thinner and soy milk is thicker than cow's milk.

"Even a gallon of water can, potentially, be fatal if you drink it quickly." But milk poses its own challenges, Brain adds. It contains three "vomit-inducing" ingredients: Lactose, calcium ...