So yeah, this video basically shows you how to instantly freeze water, but I will provide a step by step anyways.
Step 1: Put on your safety glasses because they look cool.
Step 2: Fill a bottle with water (Or get a bottle already filled with water)
Step 3: Put the water bottle in a freezer for 2,5 - 3 hours.
Step 4: Take it out and hit it on a table.
Step 5: Congrats, you got yourself some ice.
Edit: Is it only me or does the thumbnail look like an ice dildo?