Boil 6 cups water and dissolve 1-2 cups sugar (depends on how sweet you like it)
Add 6 more cups water
Add 1 can crushed pineapple and 3/4 cup lemon juice.
Put in freezer for about 8 hours or overnight. Just before you are ready to serve, start stirring to create a slush. If it is frozen solid, you may want to take it out earlier. Add 6 cups frozen berries and stir.