I discovered this when i was in a climbing shop.
some gyms moan about chalk on their black mats. even some supposedly hardcore ones (this is the uk where people use smith machines ALL the time)
Liquid chalk is chalk in alcohol as a suspension.
Pour some on your hands, let dry and away you go. clean and doesn’t get in your eyes/ears/nose/anus and keeps your grip good.
not quite as effective as real powdered chalk, but a useful alternative day to day to add in.