Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to store liquor in stainless steel flasks [title] Fill your flask with hard liquor. [step] Flasks are intended for use with straight, undiluted spirits. In general, it is best to fill a stainless steel flask with hard liquors, such as scotch, whiskey, rum, or vodka.

Ending1: [substeps] As an alternative, fill it with fresh liquor so you have cut back on the bitterness. [title] Close the outer lip of the flask. Ending2: [substeps] Avoid adding mixers to your alcohol, since many of these contain corrosive or perishable ingredients that can damage your flask. [title] Avoid putting corrosive or easily spoiled liquors in your flask. Ending3: You can get liquor from liquids inside other flask types, such as beer and spirits, or from alcohol in bars that contain the same amount of liquor. [substeps] Remove the lock and lid from the flask, and place a mason jar lid over the inside of the flask. Ending4: You can also fill your flask with liquor for ease of selection. [title] Empty all liquor from the inside of the flask.

Answer format: ending1/ending2/ending3/ending4