In this instructable I will explain how to make a water bottle that looks like water will spill all over but it has a seal besides the cap. You can easily trick people by acting like you are going to splash them with water, but the water stays in the bottle.
You will need
Step 1: Making the Bottle
First you have to fill the the bottle about 3/4 full. Then get a circular piece of plastic and glue it in. Make sure that the seal is good otherwise water is going to come out.
Step 2: Have Fun With It
When it is unexpected just pull out the bottle and fake spill it on someone and get a funny reaction.