I've been a lurker, but I just can't resist my 2 cents - Aluminum is
the most common element found in the earth's crust. Just about any
water which is not otherwise purified (distilled or ion exchanged) is
going to contain Aluminum.
The increase in concentration through contact with cans and pots will
*insignificant*.

Also note that Aluminum develops a patina of Aluminum Oxide (*) which
is highly insoluable.

* aka corundum - same stuff as rubies and sapphire