Combine crushed pineapple and cream of coconut in a blender jar.
Blend until smooth.
Add pineapple juice and give it a quick stir.
Pour in to a gallon freezer bag and place in freezer, at least overnight but up to 24 hours.
Depending on how frozen your drink mixture is, you may need to let it stand for 5 minutes up to an hour, checking often to find the desired consistency.
Add club soda just before serving.
Give it a little stir then pour in to serving cups.
Notes
You can use pineapple tidbits instead of crushed pineapple as long as you have a powerful blender.
You can lay the bag of slush in the freezer to freeze to take up less space, just ensure your zipper bags are quality and will not leak.
Add club soda to the frozen pina colada will help it to melt faster so keep that in mind when trying to figure out how much time to let is soften once taken out of the freezer.
For a party you can make several batches ahead of time and pull them from the freezer as needed.
Easily turn it into a lava flow by blending up some sweetened frozen strawberries with a little bit of water then adding to the top or bottom of the glass you will serve your pina colada in.