MAC Mineralized Charged Water
How do you feel about face mists? I don't use them all the time but they're nice to have around. Say, you over-applied your foundation or powder and would like to take the thickness down a notch - spray some mist on your face. You want to intensify your eyeshadow or powder liner? Mist your brush before dipping it in the color. You want to moisturize your face in the middle of the day without actually removing all your makeup? Mist up! See I told you it's handy. ;)
Now there's an argument to be made for simply filling up an atomizer spray bottle with water. But I swear it's not the same. Proper face mists - the one you buy off the shelves for a price that sounds ridiculous for what is basically bottled water - is better than a DIY attempt. That's not to say that a DIY mist is not any good, I'm sure it will work fine, but it's not going to be quite as nice as a cosmetic mist.
The MAC Mineralized Charged Water is water infused with diamond powder (supposedly) and a nice citrus tea scent. It delivers a very fine spray to distribute the water evenly all over the face.