How long is filtered water good for?

I have a PUR water filter on my kitchen sink faucet. In 2006 I filled 5 (1 gallon) milk jugs with this water and stored it in my basement pantry. Do you think it is good to use now? How much longer can I store it? Will it ever go bad?
Update: I was saving it for emergencies so in an emergency situation, I won't have to run to walmart for water, I'll already have it in my basement.
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