The only way I can see is to double tap the screen, end the game, then restart on one of your saved games. They should add an option to restart right away. What a fun game though.
Is that the level where there are 2 pipes and 2 containers? If so then you get the water bouncer to bounce the blue water towards the left, make it bounce onto the switch and the water will bounce off the switch into the blue container. When you've activated the switch the red water will flow for as long as the blue water is hitting the switch which should be constant. Get the flat board and make it tilt to the right making the red water flow into the red container.