Yes. Some places, such as the island of Bermuda, have giant catchment basins to gather all the rainwater that falls on the island, because Bermuda has no fresh water wells or springs.
Rain water is fresh water and does not have salt. Saltwater is not fresh and does have salt.
filter it a purify it
Rainwater is the only fresh water available on Tristan.
Virtually none. Ever fresh rainwater or snow has dissolved impurities in it.
You could try aerating it. Place an air pump (check your nearest aquarium supplier) near the butt with the discharge hose submerged in the water. A small amount of fresh air pumped into the water will keep it fresher longer.
Ponds form where rainwater and runoff meet in a depression in the landscape.
Only water is evaporated, not salt.
All rivers are fresh-water - because they're formed from rainwater runoff, which fell as rain.
to keep it fresh longer you have to put it in the refrigarator
Keep salads fresh longer by keeping them wrapped and chilled in the refrigerator.
Yes, Gibraltar has several sources of fresh water, there are two distillation plants, supplemented by boreholes, natural water catchments in the rock and they collect rainwater in very large concrete tanks.