Get a keychain breathlyzer. Image spoilered for size. Spoiler http://www.amazon.com/BACtrack-Keyc...8&qid=1394202479&sr=8-1&keywords=breathalyzer
Or get a solar powered USB charger - works wonders on long flights, train rides, or car trips. http://www.amazon.com/Opteka-BP-SC4...&qid=1394202600&sr=8-4&keywords=solar+charger