Dry Up, Thirst
You're stuck in a prison on the scorching hot sun with nothing but a spoon. Lucky for you, a tsunami is coming, right as you can feel yourself completely dry up. So you take your spoon and use the tsunami to quench your thirst.
Imagine the feeling of drinking spoon after spoon of refreshing tsunami water, replenishing your almost completely dried up body. You've been in this sun prison for longer than you can remember. You've been holding onto this spoon, waiting for this moment for so long.
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This method of quenching your thirst reminds you of being in a car wash (かわ). The water pours over you in waves, and you're stuck inside a metal cage. Totally the same thing as a car wash, right?
Imagine quenching your thirst in a real car wash. Open your mouth and let the soapy water dump on over and in you. You'll never be thirsty again!