To absorb the energy from the moon fill a Glass bowl/jug or jam jar with natural spring water or filtered tap water. and place a washed clear quartz in the water to help to amplify the moons energy cover with cling film or lid to keep out any impurities and place under the moon leave for several hours or as many as you feel you need to.
You can then use this water in a number of ways (will keep for a few days if refrigerated) you can choose to drink it before casting a spell or use to clease items ect
You can also choose a crystal you would like to absorb qualities from to make crystal water to help with confidence and self esteem you could place a ruby in the spring water and leave for your required amount of hours in sunshine/moonlight or both and drink the water before hand when you feel you might need a boost of confidence.
You can use a number of different hard wearing crystals to make crystal water.
Just make sure you choose a crystal that does not contain any harmful chemicals in it such as lead/sulphur etc and also any crystals that may tend to dissolve in water such as Selenite.
Most of all just have fun finding out what kind of water works best for you :)
Love and Light