1. Fill a large dixie cup partially with water
2. Put the small dixie cup inside the large one and press down until both cups are flush at the same level, adjust the water level accordingly.
3. Fill the small cup with water, place it in the large cup, and place a strip of duct tape across the top of the two cups to hold the small one in place.
4. Freeze
5.After 4 hours or more (varies by freezer) take the whole thing out, if the small cup is pastic it will pull right out, then run the outside of the large cup under hot water (or warm water so as not to crack the ice), turn it upside down and give it a good whack.
Method 2: (Not recommended, shot glass comes out looking weird, leaks are very common)
1. Take a large dixie cup (9 oz) and cut the bottom out of it
2. Turn the small one upside down and push it through the hole we just made in the bottom of the large one
3. Seal the bottom around the hole with duct tape (you'll need more than you think)
4. Fill with water and freeze
Method 3: It works, you can probably use things you already have but its much easier to use dixie cups
1. Obtain a large plastic cup that you would drink out of and a shot glass
2. Fill the large plastic cup with a small amount of water (half inch or 2 cm) and freeze to form a cylinder/disc of ice.
3. Take out of freezer once it is completely frozen, quickly fill with water, center shot glass, use ducttape to keep it in the middle, quickly refreeze
4. When completely frozen for the second time, put your hands around the plastic cup to heat it up until the whole block of ice can be removed from the cup easily. Set it on some wax paper or non-slippery surface. If you are lucky the shot glass will come right out, if not, you may have to gently coerce it, your breath can heat things up pretty nicely, you might use cool water (hot water might crack or break the glass).
