I love this mist. While it certainly works for a dose of hydration throughout the day, I use it mostly to mist my face before and/or after applying hyaluronic acid serums. Some people don't realize that HA is most effective when moisture is added, as it is a humectant that draws moisture into the skin. I also use it if a serum or moisturizer starts to pill. It thins things out and helps with absorption.
Of course, you COULD just mist your face with distilled water, but you wouldn't get the added benefit of all those wonderful minerals.
Bonus points - the sprayer produces a very fine mist, so it's easy to get as much or as little as you want on your skin and you don't have to worry about it spurting out! I love this product and will definitely purchase when the bottles I received from my subscription service are finished.