I once brewed up a couple of hundred Liberty caps (simmered in a pan of water for 20 minutes or so then strained) with a view to taking them that night, but for some unforgotten reason I didnt get the chance. So not wishing to waste them, I poured the liquid into an empty beer bottle, sealed with an airtight stopper and placed in the fridge.
About a year later, I split the contents of this bottle with a friend and proceeded to have one of the strongest most other worldly trips I've ever experienced. It was totally devoid of physical side effects and was quite sedating in that I couldn't keep my eyes open and had no desire or need to move for the duration of the trip. The CEVs were phenomenal and no headfuck. I actually turned into a starship that night and flew through a wormhole into an alternate universe that pulsated with colour, eventually arriving in orbit around a massive planet along with millions of other sentient starships, where we received instructions from the creator on how to engineer planets to sustain life.
It really was a trip in the truest sense of the word.
I'm not saying this method of storage is advisable due to the risk of bacterial and other fungal growth, but the potency was certainly not diminished, if anything it was enhanced.