They may be tried and true or been there done that but sensory bottles are still the neatest thing to make for contemplative quiet time.
Oil and water don’t mix – but they make the best combination of bubbles, drips and droops.
Try vinegar and baby oil to keep the water from getting cloudy
Add some food colour.
Add some 'bits' . . . . mini pom poms . . . sparkles . . . marbles . . . glitter . . . googly eyes . . . cut straw pieces . .
Seal the lid with a glue gun
Use duct tape as back up
Delight in turning these bottles upside down