JohnPatrick... a comment.. most recommend that you not use actual milk jugs to store water as there is a potential for contamination.. of course some bleach could be used if they were the only storage source...
for those without a generator to keep the refrigerator up... the 5 and 7 day coolers with multiple frozen gallon jugs of water work well...
Why would cleaned milk jugs be any more likely to contaminate any more than a cleaned jug of other vintage?
Milk jugs are designed to degrade when exposed to the elements though, so they are not real good for longer term storage.
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Warning - I am not an expert on anything having to do with this forum, but that won't stop me from saying what I think.

Bob