Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to make a slurpee [title] Chill your club soda for 15 minutes in the freezer. [step] Purchase any brand of club soda from your local grocery or convenience store. To make the traditional slurpee that's found at gas stations, it'll be necessary for you to carbonate your drink.

Ending1: Also, chilling soda takes time and effort, so chilling your beverage is essential for making it popular. In addition, chilling soda will simulate a totally different flavor scheme than freezing pop, so you won't have to worry about boring pops during your thirsty rush. Ending2: To see if it will carbonate, prepare to chill the contents in a few ounces of ice water. [substeps] If you have the required amount of ice water you can fill your drink in a cold bucket. Ending3: This is important, since it takes awhile to carbonate and needs to be refrigerated. If you don't refrigerate your soda, it'll freeze over the course of long days and make you very thirsty after a drinking period. Ending4: [substeps] You can experiment with flavored club sodas to see how that will affect the taste of the slurpee at the end. Remember not to leave the club soda in your freezer for too long or it may freeze.

Answer format: ending1/ending2/ending3/ending4