To push an equilibrium to one side, add starting material and remove product. This is Le Chatelier's principle from general chemistry.
So to push this reaction to the right and form ether, add alcohol and remove ether and water as they form.
To push this reaction to the left and form alcohol, add water to ether and remove alcohol as it forms.
How do you "remove something as it forms?" Alcohols and ethers have (relatively) low boiling points, and can be removed by hooking up a vacuum line and condenser to your reaction. The ether (or alcohol) boils off under the reduced pressure, and then recondenses in a separate piece of glassware. (Sort of like in distillation.)
Water has a relatively high boiling point and so is difficult to remove under reduced pressure. To remove water, molecular sieves are used. They're like tiny sponges that only absorb water (and not other solvents), removing it from the reaction.
