Can't what, John wonders, because that can't felt pretty sweeping. Felt like it encompassed more than just asking or enjoying something. He watches Ianto warily for a long moment, studying his expression, then takes a breath as he finally holds out something to him. He blinks, squints as he takes the canteen and hesitates.

"Not sure if the running water is safe here," he says after a moment, since it's tropical and doesn't... look like they necessarily have complex sanitation systems here. His eyes rove over the other man a long moment as he applies sunblock, then he drops his back off his shoulders again and begins to put the canteen away -- checks through the rest of the contents and idly pushes up the short sleeves of his t-shirt to check if he's getting bad tan lines.