An apparatus includes a containment structure having a floor and one or more free-standing flexible walls extending along an outer perimeter of the floor and surrounding a central portion of the floor. The floor includes one or more pieces of fabric, and each free-standing flexible wall includes one or more pieces of shape memory material and extending above the floor. The one or more pieces of shape memory material are attached to the one or more pieces of fabric via a liquid-impervious material applied to the one or more pieces of fabric along the outer perimeter of the floor. The liquid-impervious material is located on the one or more pieces of fabric and the one or more pieces of shape memory material such that the floor and the one or more free-standing flexible walls are liquid-impervious and define a space configured to retain liquid in the containment structure.