Either evaporation or crystallization.
boil the water away, leaving the salt in the bottom of the pot or whatever you used.
For example using ion exchangers.
salt when dissolved in water will become an acidic solution
No, a salt is a compound. A salt maybe dissolved in water and made into a solution but as salt is not a solution per se.
When salt is dissolved in water, it is in a dissolved state where the salt particles break apart into ions. This creates a solution where the salt ions are surrounded by water molecules.
Brine.In your example, the salt is the solute while the water is the solvent.
Salt water can be treated to remove the dissolved chemicals - making it safe to drink or bathe with.
When salt is dissolved a water sodium chloride solution is obtained.
The separated salt is a crystalline solid; the dissolved salt is dissociated in ions.
Filter paper is designed to physically separate solid particles from a liquid, based on size. Salt and sugar dissolved in water exist as individual molecules or ions that are too small to be captured by the pores of filter paper. To remove salt or sugar from water, processes like distillation or using a reverse osmosis filter are more effective as they can separate dissolved substances from water at a molecular level.
The Life Straw will not desalinate salt water, remove dissolved chemicals or minerals, nor remove viruses.
Salt