When meth is damp it's harder to fool with. I kept mine in the bathroom closet. I think it managed to collect water molecules from the air even though I had it inside waterproof that was inside waterproof inside the closet which was closed.
I moved it and let it air out for a few days, then I crushed it and laid my lines. It was as potent as ever. Sometimes I think I'm going to want some so I purchase some, and later on, I'm not in the mood for it. I've had crystal just hanging out on my meth mirror for a week or more and it sticks to the mirror so I have to crush it and line it again. But it was as potent as ever.
I left some in my room once for a month. I bought it to go out of town and I forgot it. Shit happens. But the meth was as potent as ever when I got home.
I don't shoot crystal meth or smoke it. I rail it and I have to be in the mood for it. Sometimes I pick up extra because its there and I'm there. I forgot about some I left in my winter coat pocket, and found it the next winter, fortunately before I took the coat to the dry cleaners. The meth was as potent as ever.
You have to keep meth dry. If it is a little wet I can still crush it and line it. I do not know how you are using yours, but you don't seem to know what you should know before using it. Are you sure you have crystal meth? Are you planning on using it by yourself?