Underwater Bouquet Materials: clear plastic waterprrof container and lid modeling clay small bouquet of cut flowers plate water Method: Pick a small boquet. Fill container with water. Attach lid and turn upside down in the sink to test for leaks. Take off lid and fasten a lump of clay to the inside. Secure bouquet in the clay and lower it into a sinkful of water. Slowly fit container over bouquet - making sure all the air bubbles escape. Fasten the lid and lift the whole thing out onto a plate. Flowers will stay fresh for days. .