Is It Safe To Drink Water That's Been Sitting Out All Night?

Many people tend to leave a glass of water on their nightstands to take a sip during the night or early in the morning. While doing so isn't really unsafe, it can affect the taste.

On its own, a clean glass of water is fine to drink from if it's only been left out overnight. However, carbon dioxide exposure can lower its pH, resulting in a flatter flavor.

However, anyone could have taken a sip and transferred their bacteria onto the water, or insects could have entered the water overnight. So, it pays to cover the glass for safety.