The water bomb is a type of origami. You can make one and fill it with water if you don't have a balloon handy.
Steps
Step 1. Get a square piece of paper (don't use origami paper, it would be a waste
Use printer paper, fold it diagonally at the top and cut the strip. You can also use wax paper to better contain the water. Or you can use oil with the paper to make it water resistant. It works in all ways!).
Step 2. Fold the paper in half diagonally and re-open it
Repeat in the other direction. You will get an X on the sheet.
Step 3. Turn the paper over and fold the top and bottom in half
Step 4. Turn the sheet over again and press in the center as you fold it inward along the folds
You will get a triangle. For a more detailed explanation you can read the dedicated article on how to make an origami triangular base by wikiHow.
Step 5. Fold the folds on the front towards the center
Repeat with those in the back. You will get a square.
Step 6. Fold the side corners towards the center line
You should get a small pocket.
Step 7. Push in the folds above the pocket
Step 8. Repeat these last two steps with the other side
Step 9. Blow into the hole at the bottom to inflate the water bomb
If you are using wax paper this step may be difficult, so use a straw to blow.
Step 10. Fill the water bomb in the sink
Step 11. Finished
Warnings
- Be sure to fill the water bomb immediately before use if you used printer paper. Otherwise this will melt.
- fold carefully and carefully to get a good shape.
- Don't overfill the water bomb or the paper will tear.
- Be careful when carrying the water bomb, the paper is thin and may tear.