What is the healthiest hydrator?

1) Plain water is the best way to hydrate. 2) Milk:

Because it's so much thicker than water. You might think milk could dehydrate, but that's not the case. In Condition to Calcium and vitamin D milk contains protein to keep your fueled on even the hottest of days another things water can't do. ( There's a list of the top 3 best Hydration Drinks). I posted a picture of number 3.

answer(b) keep oxygenated and deoxygenated blood separate;