Do Plastic Water Bottles Melt?

Do Plastic Water Bottles Melt? High-density and low-density polyethylenes — HDPE and LDPE, or recyclables 2 and 4 — melt at 130 degrees Celsius (266 degrees Fahrenheit) and 120 degrees Celsius (248 degrees Fahrenheit), respectively, according to Dynalab Corp. How long can water sit in plastic bottle? How long can water be stored safely? Although