Abstract: A double bed arrangement having a combination mattress including a liquid filled side and a non-liquid filled cushion side. A compressible foam tray holds the non-liquid cushion side in a first portion or half of the tray with the liquid-filled cushion being located in a second portion or half of the tray. Preferably, the liquid filled cushion comprises a plurality of water filled tubes. A first waterproof liner covers the foam tray and a second waterproof liner covers a bottom surface, side surface, and at least a peripheral portion of the top surface of the non-liquid filled cushion.