Question

When both water and salt are present in a solution and the cell needs water which process enables the cell to obtain the water without the salt

Answer 1

The answer of your question is "osmosis through semi-permeable membrane"

Osmosis is actually the process through which water moves from higher concentrated area to low concentration of area through the semipermeable membrane.
So whenever there is shortage of water within the cell the water in solution outside the cell are high thus resulting in the movement of water in to the cell as the result of osmosis while not drawing any salt from the solution.This is done in order to equalize the amount of solute on both sides of cell.