Be course you can do a lot of different things with a
smooth formed Plastic Bottle, I made a separate article.
Materials to make a smooth formed bottle
Light weight Pet Bottle
Tools to make a smooth formed bottle
Big pan
Protective glasses
Protective gloves
How to make a smooth formed bottle
Safety
Wear protection like protective glasses and gloves
Unfolding the bottles
Take the labels off the bottles.
2. Put boiling water in the PET bottles.
Tighten the screw cap on the PET bottles.
Put the PET bottles in a pan, and heat up so the water in the PET bottles will steam.
After a few seconds the heat and the steam will unfold the bottom of the PET bottles.
The botte gets proxematly 10% smaller
WARNING - Only steam the PET bottle for seconds, otherwise the screwcap will pop off and the bottle will fold together rendering it useless.
Cool down the PET bottles until there is no pressure inside.
Cut the bottle
Now you have a Smooth formed Plastic bottle.
The bottle is smaller.
The surface is smooth formed.
The plastic material is thicker and stronger.
This can have advances, for some use.
You can do a lot of thing with a smooth formed bottle
-solar water disinfection
-protective lamp cap
-If you glue reflecting material inside you can make a reflector for a camping lamp