The default Fire Texture show up, but now you want to make the Wet Texture or Real Watereffect. Use the dropdown menu from this option with it's small arrow. The Wet Texture will produce rain and wet effects, this one will need a source texture to put the effects on. It makes use of the Dragwork with the mouse in the "Preview Area". Again, the clear button will stop the current animating effects to allow the new effects. The Wet Texture is NOT limited at the source size, nor beeing it square or rectangle. With 20 effects as for the Wave texture, you have toys enough to play with, and something i forgot to mention in the Wave Texture is, that you the effects are additif, meaning that you may have one effect playing, then adding another effect to it, making the final texture having 2effects on it.