Keep them stored in a cool dark place.
Under the bottles will be a MSD which is a date the manufacturer should sell the product. The product is good for a couple of years after this date. I can't remember specifically how long superdrol is good for after the MSD.....but I've even seen logs with people that have kept it for SEVERAL years and it still worked fine for them.
Contact Mrsupps through chat or email. They're good at responding rather quickly.