The real question is where the "water" is.
You can't avoid getting water in your external ear canal when you dive. That water is usually pretty easy to get out, simply by tilting the head and manipulating the outer ear. Alcohol-containing drops can help as well, and some people do need to clean the wax out of the external canal to avoid water trapping.
Most of the time, when new divers feel that they have water in their ears after diving, it's because they have fluid in the MIDDLE ear. This fluid accumulates because they clear their ears too infrequently, and allow negative pressure to exist in the middle ear for too long. This negative pressure draws fluid out of the tissue surrounding the middle ear. As a result, after a dive, there is a feeling of fullness in the ear. There may be bubbling or crackling noises, and muffled hearing.
Middle ear fluid will resolve over a period of days. The process may be hastened by the use of antiinflammatory medications like ibuprofen (assuming you have no contraindication to their use) and by decongestants like Sudafed. But it is better to prevent the problem, by learning to equalize early and often.