Moon water has many uses. You can anoint yourself with it as you would with perfume to increase psychic awareness, as a spell ingredient to enhance spells for love or prosperity, or as a blessing ingredient.
Moon water is generally made on the first night of the full moon and uses water which has been gathered under the light of the moon so it is not contaminated with solar energies. There is a step-by-step how-to at http://lunalunamag.com/2014/01/15/luna-luna-full-moon-water-magic/
One can also make "Sun Water" by doing the same process but leaving the jar out in the sunlight during the day. Sun Water can be drunk to bring the energies of the sun into yourself. It's not as often used as Moon Water.