According to Mike, in regards to shelf life of his liquid research chems:
"They vary from chem to chem, but generally speaking these chemicals all stay good for several years before they even start to lose potency...and when they eventually do start to lose potency, they only lose a few percent potency each year. Some chems stay good for over a decade."
Just store them in the right conditions (cool temp room, out of direct sunlight) you should be just fine for a few years.