need ideas for a contraption that will transport up to 10L of water across a 3 meters on a counter surface. Further Design Considertions: No kits or animals may be used. Propulsion device that you design make must made from simple compoents such as springs, elastics ect. Device may not be attached to the table by any clamp or glue, etc. No energy may be input by the operator other than the one stored by the device. The operator may cut a string, or flip a switch. Additional limitations: No rockets permitted No chemical reactions or explosive reactions. No air compressors or compressed air, CO2 cartridges. No electricity (batteries, and simple electronics are ok.) Not asking for a complete project here, but just some ideas on how to make it move, and work. We already have a couple of ideas, but looking for more. Thanks.