- Chemical and Physical Indicators of Container Degradation. In an urban setting, scavenged plastic is often the most dangerous variable.
- Identify the Plastic Resin Code.
- Check the bottom of the container for the recycling triangle.
- Avoid Code 3 (PVC) and Code 6 (PS): These can leach phthalates and styrene, which are toxic over time.
- Avoid Code 7 (Other/BPA): Many older or specialized urban plastics contain Bisphenol A (BPA), which mimics hormones and is unsafe for long-term water storage.
- Target Codes 1, 2, 4, and 5: These are generally considered food-safe plastics.
The "Sniff and Squish" Test
A believable survivor relies on their senses when labels are missing:
Chemical Odors: If the container has a "plastic-y" or "new car" smell, it is likely off-gassing chemicals into the water.
Structural Brittleness: If the plastic turns white when flexed or feels "crunchy," it is degrading from UV exposure. This releases microplastics and chemical byproducts into your supply.
Check Previous Contents (The "Ghost" Effect)
In an urban environment, "scavenged" doesn't mean "safe."
Porous Absorption:
Plastic is porous. Containers that previously held detergents, pesticides, or gasoline can never be fully decontaminated for drinking water, even with bleach.
Biofilms:
Look for a "slimy" interior texture. This indicates a biofilm of bacteria that has anchored into the plastic's surface, making it nearly impossible to sterilize without heavy chemicals.
Visual Warnings
Cloudiness: Clear plastic that has turned opaque or "milky" is a sign of polymer breakdown.
Scratches and Scores: Deep internal scratches harbor pathogens that boiling or tablets might not reach.
Would you like to focus on improvised filtration methods for the water you've collected, or should we cover stealthy storage
