Once I had to drink barium while being tilted upside down on a big table while they watched it with X-rays… apparently that’s a medical test lol I didn’t find it anymore difficult than drinking normally personally but it has to do with the strength of your swallow most of all, which is what they were testing at the time.

Yup, cures my hiccups. Lay back over something so mouth to stomach is reverse inclined, as close to vertical as I can get. Then take several swallows of water. Either one mouthful that I took before I laid back swallowed a little at a time, or several sips from a straw after laying back.