This is my favorite way to make jell-o for office parties and when entertaining. Because you have to wait between layers for the jell-o to set, I usually start it a day or two before I need it . I do one layer before going to bed (or before leaving for work) then the second layer when I get up or whenever I have time like after work the next day. I usually have a little extra mix left over from layer two. I just put it in a small container and enjoy it for a snack. You will need a jell-o ring mold to make this as written but you can use anything you want to like little custard cups, etc. Water comes to a very fast boil so it takes almost no time at all except for the refrigeration time. Your number of servings will depend on how big you cut your slices.