Deep frying oil

[LordGrover]

What do you do with your cooking oil when not in use?
I'm toying with buying a deep fat fryer but it's only likely to get infrequent use. Capacity seems to be about 3 litres so do I need to get a large glass bottle or two?
Do I need to keep oils separate for frying fish? I don't much fancy fish flavoured chips with my steak.

[LordGrover]

21TonyK said:

It stays in in the fryer with me. Only time I empty it is to clean it. Oil only absorbs really string flavours and then only with prolonged use.

Is it often used? Is it okay to leave for weeks/months at a time?