Re:Storing Fryer Oil
I wonder if they make pressure cookers large enough, or something steel construction pot with a heat resistant gasket lid.
Similar to RKG's suggestion, I wonder if you could get a stainless steel container fabricated locally. Something that obviously would not melt or affect other materials it came into contact with when storing hot oil.
Then, like he suggested, when cool, drain and strain and re-use as appropriate.
You might be able to find metal 5 gallon buckets, but I can't imagine what kinds of foods they'd be storing in order to be food safe when you got them.
You could try to modify a large stock tank that is properly buffered from other materials it contacts. The tight fitting lid is the key. Maybe there is some hardware out there that one could affix to a stock pot lid to make it bear down tightly on the pot. Perhaps incorporate a heat resistant gasket or even try to make one with some food safe silicone.
Good luck. Post your creations for other to learn!