This recipe is from my Kitchen Chatter Cook book Number 1 that I published in 1982. This can be made with other flavors of frozen juices - just exchange the ones listed or just one and add another in it's place. I like cranberry/lemon too! Also the type of liquor you use can be changed just use the same amount of whatever you decide to use.
Combine lemonade,limeade,water and rum or whatever liquor you are going to use in a plastic ice cream bucket or large Tupperware container.
Slowly pour in the 7-UP. gently stir until all is combine and dissolved. Place in freezer until ready to use. Usually overnight.
When ready to serve scoop some out into glass of choice-(I like Mason jars)about 1/2 full of slush and add additional 7-UP to the top- stir to mix and Enjoy. Keep bucket in the freezer, if any is left.LOL