you can boil it and make it soft
Yes, softened water can be used to water plants effectively, but it is important to monitor the salt levels in the soil as softened water may contain higher levels of salt which can be harmful to some plants.
pump it out
Water is not softened with deuterium.
If your water is naturally soft it is perfectly safe to drink. If your water has been softened by a "water-softener" it contains sodium ions as a byproduct of the softening process. Having an intake of this much sodium in your drinking water could be detrimental.
the water temp. must be quite warm
The easiest way to separate a solid from a liquid is by filtration.
The easiest way is to evaporate the water off which may be speeded up by boiling
Yes
Watercolours are a type of paint media, softened for use by water.
Water changes are the quickest and easiest way to lower nitrates in a marine aquarium.
Easy. Melt some ice. There you have it. Easiest way possible.
Easy. Melt some ice. There you have it. Easiest way possible.