DIY - Fun for Kids - Make your own jellyfish in a bottle. An awesome preschooler and kindergarten science project! - Fun Things For Kids Things you need to make your own jellyfish: 1. Transparent plastic grocery bag 2. Plastic water bottles. 3. Thread 4. Food coloring 5. Scissors Instruction: • Flatten the bag and cut off the handle and the bottom part. • Cut along both sides to split into 2 plastic sheets. • From the center of the plastic sheet, fold it like a tiny balloon to make the head part and tie it with the thread -- not too tight. You must leave a little hole in order to pour some water in the head part. • Cut from the edge up to the head part roughly. You'll get for about 8-10 tentacles. • For each of them, cut again into 3-4 small strings -- and just cut off the remaining part. • Trim to make random long and short tentacles. Enjoy.