Pro tip: reverse osmosis is more practical at getting the equivalent of distilled water. In either case, you might find that drinking either type of water will not make you feel "quenched". This is because of lack of minerals and it might lead to all kinds of health problems. If you are going to drink deionized water, you night consider buying unsweetened cherry juice, just a splash in your glass. This will raise the pH to a level that your pallette finds more satisfying.
RO water is excellent in your coffee maker or tea pot because it will never cause calcium scaling. However, you cannot use it in beer making because the yeasts require the minerals that naturally occur in spring water (or so I hear).