Self-sustainability | Upcycle Plastic Edition
Emergency Clean Drinkable Water

Tie a plastic bag around a non-toxic plant for 3-4 hours. [Source] (01)
Plastic Storage-Container Greenhouse

Re-use a broken plastic storage container to make a mini-greenhouse. Place in brightly lit spot, but out of direct sunlight so you don’t cook your plants.
Winter Protection
Use plastic bottles with the bottom cut out to protect plants from severely cold weather over winter. (Source) (Source) (02) (03)
Plastic Bottle Self-Watering Herb Planter
Source: Countertop Gardens, p. 118-119 (04)
References