Sounds like something to discuss with your doctor before you travel. Surely a trip lasting longer than your script wasn't something that just happened last minute.

Cutting the shit, since you're all but screaming about committing crimes...

I would really, really suggest not playing games with stimulants from untrusted sources. There are plenty of stories of people doing things completely on the up and up through their doctor and getting screwed when their doctor or pharmacy switches them to a generic brand version manufactured by a different company that is not as effective for them.

That's going through proper channels, getting medicine manufactured by properly controlled companies. I'd hate to think how wide effectiveness could swing outside that environment, even if what you got was "pure".

You're far more likely to find it in stock just by checking an ever increasing radius of local pharmacies. I get mine from one an hour away from where I live, but not too far from my work so it all works out. Pharmacies in higher population areas seem to have a better time getting stock.

Lastly, the fediverse is probably the last place you want to be posting about committing felonies. All it takes is for the post to be federated to an instance that doesn't federate deletions and it will live forever.