Build the hypothetical ship in space and you never have to deal with it except as ice, which is easier to move around and shape into what you need. The ISS has a lot of liquids on board in all sorts of forms, from chicken soup, to ink pens, to the urine inside astronaut bladders. I don’t understand what you’re trying to say.

They did that in the novel “Seveneves”, used a massive chunk of ice as the bow of their ship on a one-way, twenty year plus trip. It didn’t stop all the radiation, though. Just enough to keep a minimum number of crew alive to complete their mission. They all developed different types of cancers, anyways,but the kinds that could be treated along the way and extend their chances.