Water enters the cell by the method of osmosis which is the flow of water through a semi permeable membrane from higher concentration to lower concentration. It is basically passive transport.water crosses the cell membrane of the cell consists of a phospholipid bilayer which consists of a hydrophobic (outer or facing the environment) end and a hydrophilic (facing the inner side of cell )end ,so water crosses this membrane which is semi permeable and enters the cell.
