A problem which can readily be solved by putting your alcoholic beverages in a flexible container, like a hydration pack. Based on Ruken’s information, even if they’ve absorbed pure alcohol into the powder, it probably works out to exactly the same alcohol per unit of volume as liquid-form vodka, so there isn’t any real space gain.
My state, which maintains a legal monopoly on the sale of distilled spirits, has just banned powdered alcohol. I take this to mean that the powdered form carries a lower profit margin.