your bathtub if is doesn't leak. Otherwise might need to get a plastic stock tank.
I would just get the giant rubber maid brute trash cans.. Those are heavy duty and extremely sturdy and should work well
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not food grade i thought ..
you are talking about these right ?
http://www.amazon.com/Rubbermaid-Co...pebp=1433880847926&perid=1GWCY48WWZ0KGFVYBVQ0
EDIT : the reviews does say they use a lot for RO and salt water mixing nice
HD has the 44 gal units on sale for $40....55 gal is $105....