I store all my factory sealed film in the freezer. When I take it out, I let it take at least an hour to warm up.
If the film has been opened but not loaded into a camera, I store it in the refrigerator.
Therefore I do not worry about film becoming out of date.
I use Kodak XTOL developer from a 5 liter kit. I store it in 1 liter StopLossBags
TM www.StopLossBags.com. I use XTOL in the replenished fashion as described:
By keeping the developer in these sealed bags I have keep mixed XTOL for many months and sometimes years. I always test the developer with a strip of film before I start developing rolls especially if I have not developed film for a while.
I use Kodak Dektol for paper developer and frankly while it will keep for a while in tightly sealed bottles, all paper developers do not seem to have a long mixed storage life.
Please feel free to ask more questions.