Step 1: Materials
Step 2: Make a square
If you are using notebook paper you might want to fold it over to the red line because the holes will let some air out, rip off the side with holes on it after folding.
The picture that says rip off is the bottom of the first picture (the loose end).
Step 3: Fold into waterbomb base
I highlighted the X for you to understand what I mean.
Step 4: Make the inside
Step 5: Fold in the edges of diamond
(The black is from the marker on the X).
Step 6: Finished
The picture with hands is how you should hold it when you blow it up.