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What can I do with 20 plastic bottles? Answered

This summer was especially hot and I ended up with about 20 or so plastic bottles. I want to use them for something useful around the house like maybe a chandelier or a lamp shade but am looking for other more interesting/creative uses for them. Any ideas or suggestions ?

These are green half litre plastic bottles, the king that aerated drinks come in (see picture).


my mom fills them with water then flips them upside down and sticks them into the soil of her indoor plants and they drain when the plant needs water it is really cool you can also do it with outdoor potted plants

Make a flood and drain aquaponics system.

Fill them with sand and then mortar them into holes in walls/foundations.

Make a set of measuring cups by cutting the bottles to different heights.