I'm sorry you're back w/ worries but good to see ya again. You will be fine, it could have been the heat got to him (especially if he wasn't drinking wnough water) or soemthing could have sat wrong in his stomach. If it was only once and the water stayed down he's probably fine. And even if it is a virus you took all precautions and should be just fine.
\"As soon as you trust yourself,you will know how to live.\"
Johann Wolfgang von Goethe
\"Do not anticipate trouble, or worry about what may never happen. Keep in the sunlight.\"
Benjamin Franklin