I think people focus too much on the "legal" aspect of Meds and travel, something to be aware of, but unless you are hauling serious pain killers in quantity, you would rarely if ever be questioned about small amounts for personal use.
However, you should consider what would happen if you lost, spilled down the drain, miscalculated, or found yourself in an extended delay; and needed to get a re-supply.
It is only common sense advice that what ever packaging you use should have an identifying label, and separately, whether it be something from your Doctor, duplicate labels, or other info, a listing of the drugs you take, why, and Generic name and dosage that a pharmacist/Doctor in another country could determine a replacement.