Paint your water bottle with a thin coat of pink paint so it's completely covered, but the light can still shine through.
Wrap 3 red pipe cleaners around the bottle. Twist each one in the center at the bottom to create the insect legs.
Glue 2 small foam heart stickers on each side of the ends of the pipe cleaners to create the feet.
Glue 2 large foam hearts to the top of the bottle to make the wings.
Wrap another red pipe cleaner around the base of the mouth of the bottle then twist. Wrap each end of the pipe cleaner around a pencil to create a coil.
Attach 2 more small foam hearts on each side of the ends of the coiled pipe cleaner to create the antenna.
Glue 2 googly eyes onto the outside of the lid of the bottle.
When the bug is ready to be lit, activate 3 glow sticks and insert them into the bottle. If necessary, bend the glow sticks to make them fit.