Packets can be found in pharmacies and stores in most countries. Many places do not have washing facilities. If you take medication, always pack more than you think you'll need. If you are prone to queasiness, there are many medicines available such as Dramamine. Take it ahead of time to prevent problems, and make sure to take extra in your carry-on.
Some countries have a zero-tolerance policy on drugs, even prescription medication.
Drugs that are readily available in Canada may be illegal in other countries. Call your destination's embassy or consulate. Always carry prescription medications in their original pharmacy containers. Always carry medicine with you in the case that luggage is misdirected. If you have a medical condition it is advised to wear at Medic Alert Bracelet.