Just fill the bottle with water and drop in a tablet. Let it work its magic for half an hour and then rinse out.

Promising review: “In all fairness, I first heard of this product while watching Shark Tank, and their pitch was impressive so I gave the underdog a try. Now, I’m on my fourth reorder. My whole family drinks out of various name-brand bottles, coffee mugs, etc. The fact is, they are rarely cleaned because they are a part of our daily lives and they are a pain in the ar$e to clean, because of the inconvenience that they are not dishwasher safe or don’t fit. The answer is these tablets. They work and they’re simple to use.” —K.R.

Get a pack of 12 from Amazon for $8.

Source: https://www.buzzfeed.com/bekoconnell/shark-tank-products-that-i-would-invest-in