The best way to store 20 liters of mixed C41 chemistry is three boxes of Grolsch beer bottles

[Sirius Glass]

That is a lot of stress on the kidneys.

 

[mnemosyne]

Wine bags aren't at risk of being mistaken for beverage containers? You're gonna have to help me understand that one...I'm confused.

A wine bag is simply a clear plastic bladder with a spigot. There is nothing written on it and there are no labels (in case you reuse a bag that was originally sold with wine, this is all on the outer cardbox which you will discard). You can label the bags easily and very clearly with a sharpie. So the bags are not any more likely to be confused with beverage containers than any other unlabeled clear plastic container or unlabeled glass bottle would be.

 

[mnemosyne]

What 20 liters? The largest bag I know of here is 5 liter.

The 10 liter size is easily available through the local German site of that big online auctioneer. You could always split up 20 liters on two bags. Actually, I would even recommend using four 5 liter bags for better handling.

 

[Europan]

Can’t you use Grolsch as developer, stop bath, and fixer? That would simplify everything. Kidding.

 

[AgX]

In the past you could use the water of the River Rhein to process film. At least one band sung about it...