Another good source for larger containers is your local garden center. I scored two surplus 'glycerine' drums (probably close to 45 gal) for $25 each at Swan Lake Nurseryland north of Vernon. They sell them as rain barrels so I'm using one for that and the other to collect RO waste water which then is also used in the garden. Apparently the glycerine is a food safe product (byproduct of making bio diesel?) so with a good rinsing it should be suitable to store RO/DI water as well.
Your local on premises beer making outlets will also have large food grade 45 gal drums, however the one I frequent in Vernon wants $45 or more per barrel, so the glycerine drums were a steal.
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