On my first ultra long haul I didn’t bring a full water bottle on the flight and boy did I regret it! Up until this point my longest flight had been 8 hours to Europe, but the flight time between Seattle and Singapore is roughly 16 hours! It didn’t even cross my mind to fill or buy a water bottle for the plane! Around hour 10 I was so dehydrated and so thirsty and the little cups of water Singapore Air hands out weren’t cutting it especially since my husband was trying to share the water with me instead of getting his own! I got off that flight with such a bad headache and a promise to never fly without a water bottle again 😂