I use Water Wetter with distilled water. Super cheap, not slick (well, as slick as regular water, I guess), and has the faint smell of pork rinds. Best thing next to just distilled water in terms of cooling, and the water wetter will keep things from rusting/corroding (which would/could happen with only distilled water). Totally good to go for track days too, while regular antifreeze and even engine ice sometimes is not.
Only downside would be if you're in a cold climate and your bike sits outside. This is a coolant, not an antifreeze. Bad things could happen... But mine sits in a garage over winter.