I received a bottle of Star San today but Royal Mail had managed to drop it and somehow break the cap (not the shop's fault by the way - it was well wrapped in bubble wrap and had tape declaring "fragile" all over it). Royal Mail had stuck it in a plastic bag with a stock apology and not even bothered to tape the cap up, so the contents just leaked all over the inside of the plastic bag

Anyway, does anyone know if the Star San that's still in the container will be OK to use bearing in mind that it's possibly been opened for several days, or does the container need to be kept sealed?
Thanks in advance,
Al.