3 ways to make crushed ice at home:

#1. Find an old, but tough tea towel and a rolling pin. Place your cubed ice (about 3 handfuls) in the towel and bundle it up - don't leave any holes! Then knock the living daylight out of that ice till it's all nice and mushy.

#2. Place ice cubes in your blender. Fit the lid and blend at maximum speed until all lumps are gone.

#3. Run the ice cubes through your paper shredder.

Now that I have given you these 3 choices, please only use choice #1, as the other two are not recommendable due to a high risk of damage to the equipment...