Charge Water Orb is an enchantment spell that requires a Magic level of 56 to cast. It can only be used on a water obelisk after climbing a ladder in Taverley Dungeon, being very close to the fire obelisk. To get there, players must traverse through the Taverley Dungeon either through the long way around or having 70 or 80 Agility to use the shortcuts (boosts may be used).
If you have an unpowered orb and the correct runes in your inventory, each cast will create a water orb.
The fastest method of charging would be to have a Player-owned house located in Taverley, with a mounted amulet of glory, requiring 47 Construction, and using a Teleport to House tablet to get to Edgeville via the mounted glory, bank, and then return, requiring two tablets per trip. It is highly recommended to have the high agility requirements for the two obstacles as it significantly lessens the time for each run and makes this a good way to make profit.