Each popsicle mold holds about a ¼ cup, so in all you want a little less than 3 cups to fill all of them.
Lime popsicles: ¾ cup lime juice, 2 cups water, ⅔ cups sugar.
Mango popsicles: 2 cups mango, ⅔ cup sweetened condensed milk, 1 cup milk. Reserve some mango for chunks, blend it together and mix.