Oh, the tap water on planes topic is quite something. I've read up a lot about it and even attended a couple of seminars where food and water safety on aircraft was the hot topic. Basically, the water tanks on airplanes aren’t always cleaned as thoroughly or as frequently as you might think. Plus, the tanks are really hard to access and clean, which means bacteria like E. coli can thrive if the cleaning isn't up to snuff. There have been studies, like one by the EPA a while back, which found a significant percentage of airplanes tested had tap water that didn't meet safety standards. So, whenever I'm flying, I stick to bottled water for drinking and even for brushing teeth. It's a simple step that avoids any risks of getting sick from contaminated water. And honestly, grabbing a bottle of water in the terminal before boarding is no big hassle. Better safe than sorry, right? Always remember, when you're up in the skies, go for the sealed bottle to keep things on the safe side.