I used to know someone who had to use water thickeners because of their MS. They couldn't properly swallow fluids anymore, so they consumed e.g. thickened tea on a spoon.
Thick water? No, it's meant for people that have trouble drinking water, either because of the consistency, or a disability that prevents them from drinking it.
In what way is sirup or honey easier to swallow than water? I'm asking for real because if anything I see it as quite the opposite. There's a reason one blends food for people who have trouble consuming solids
Near the end of his life my father had a condition that made it hard to close off his windpipe when taking a sip of water. They gave him thickened water in hospital to help with that.
As someone else mentioned, it can be consumed with a spoon, for example. It can be as thick as honey, so you wouldn't necessarily be drinking it from a glass.
Oh and rereading your comment, I should add, this is meant for the opposite problem. Yeah, you blend food for people who have trouble with solids, but this is for people who have trouble with liquids and prefer solids.