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Vacuum sealing asparagus is the preferred method of freezing asparagus because it removes the cold air that causes freezer burn, or oxidation and dis-colorization of the spears, which can cause the spears to have an off taste that will spoil the flavor and texture of the asparagus.
Cover the top loosely with a plastic bag, and store in the refrigerator. Change the water daily. This will help keep the stalks firm and crisp until you are ready to cook them. You can also wrap the trimmed asparagus ends with a damp paper towel and store the stalks in a plastic bag.