Over some time I have accumulated several plastic milk jugs and I'm considering using them to store water in case of an emergency. I've rinsed them out and left them to dry, but should I worry about cleaning them further? Should I use dish soap/scrub brushes? Will the cleaned jugs be sealed tightly enough to prevent the water from becoming contaminated?
Cleaned jugs are, but ones that are only rinsed aren't. After the milk is gone, wash the inside of the jug with hot water and anti-bacterial soap. Rinse with super-purified or distilled water to avoid the risk of re-introducing contaminants to the inside of the jug. I store the filled bottles in my cold room for six months, then use the water and replace my stores.