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[pugsly]

Hi again everyone.  Still a dwarf fortress noobie here but learning more and more with each lost fort.  I decided to challenge myself a little more than usual and embarked with no water source on the surface, in a cold or freezing biome if that makes a difference.  I breached the caverns but what looks like water graphically is described as pools of mud.  Not muddy water but mud.

My question is can I use this as a water source somehow?  I've never set up a screw pump but think I read somewhere they are used to purify water, that may be the furthest thing from the truth though.  Any help would be appreciated, thanks all.

[zehive]

if when you press 'k' and hover over it, it doesn't say Water or Stagnant Water [7/7] ect, then its not somewhere you could get water

[KainInt]

As of recent versions, pumps no longer clean water.

[TheLinguist]

Is it brown rather than blue, by any chance?

Well, if you can't get water there, you might be able to go to lower levels of the caverns. Maybe try that?

[Thudde]

"Mud" means its regular stone that is wet.  All cavern floors are mud, so you can plant on them.  They are not a water source.

[Sphalerite]

As of recent versions, pumps no longer clean water.

What makes you think this?  Nothing has changed recently in how pumps and water contamination works.

[schismatise]

I've never set up a screw pump but think I read somewhere they are used to purify water

Correct.

As of recent versions, pumps no longer clean water.

Incorrect.

[Sphalerite]

Technically, screw pumps don't so much clean water as destroy water at the pump inlet and create water at the pump output.  If the water at the input was contaminated, and the output tile doesn't have contamination or saltiness, then the pump is effectively cleaning water (by destroying contaminated water and creating clean water).  You could just as easily pump water from a clean source into a contaminated one, if you wanted, in which case the pump would be uncleaning water.

[schismatise]

Technically, it would still be destroying clean water and then creating new clean water (it's even more clean because it's new!), which then falls into a contaminated reservoir and becomes not so clean. Oh how i do love to be pedantic! 

(chuckles)

[Flying Dice]

IOW screw pumps act like Star Trek style transporters, except only for fluids.