User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-4902593-20130225075602/@comment-3146930-20130303150343

At some point it is mentioned that Frank went to a local shop to buy water bottle for everyone (after the gryphon attack and Percy fell in a sink hole, leaving Frank to be the least muddy), but I couldn't find the paragraph you were talking about. It is also mentioned that ice vapor made up part of Percy's mini-hurricane if that is what you mean, but that could have just been a result of the wind of Percy's hurricane.