Plane doctor psa: It's going to be hot this summer and you find a local Seeker wading in shallow waters if it gets too hot. Do not worry but, first make sure your alien friend did not mistakenly choose a body of salt water to cool off in (if they did, they need to thoroughly rinse out the salts and consult a Cybertronian medic). But if they choose to relax in a clean fresh water source, offer an energon cube or fresh can of oil and join them. They maybe happy to have some company :]