Reading this thread, I initially thought this was a Custom Workshop request thread.
Not a bad idea, especially for those that don't know how to mod requesting shops to be modded in; just be certain to mention what version of DF and what mod you'd want it to be featured in.
An example of what I was thinking:
Game Version: DF 0.34.07
Mod: Vanilla (Just DF, no mods) and/or Deon's Wasteland Mod
Request:
Moisture Vaporator (3x3) -- Sorta like in Star Wars (actually, I've yet to see a Star Wars mod). Regardless of biome (even if there's salt water), provided you have buckets, can provide fresh water. Small chance of collecting various mushrooms that grow in/on it. Must be crafted out of 1 metal bar and 1 clear glass block. Can be used to purify salt water and murky water as well. Result of purification from salt water is 1 salt block and 1 water bucket, and purifying murky water gives 1 clay block and 1 water bucket.
Another idea:
Manna Machine (3x3) - Similar to above, except allows your dwarves to brew mannah (or sun-chlorella algae) regardless of biome. Requires 1 metal bar and 1 clear glass block. Requires 1 bucket of fresh water to produce 1 bucket of algae. Resulting algae can be pressed into an algae cake (can be eaten raw or used as an ingredient). Would work wonders with the Vaporator Water Still.
EDIT:
Nevermind, found a Star Wars Mod. Seems like it was discontinued long ago.
Of course, what I had in mind about a dwarven vaporator is that it would operate more like a still (reason for the glass as well is to work like a magnifying glass to boil the water put inside it using sunlight).