Water. Why is it so important for us? Because it makes up at least 70% of our body! On top of ridding toxins and reducing/eliminating dozens health issues, it can also slow down the aging process, I'm all about that! So get your water intake up, at least 10 glasses a day...if you want a challenge, drink more! Try filling a Mammoth Mug and drinking one full jug a day.
Pure water is best, try not to add flavouring to it, reduce your chemical intake :)