I'm laughing at my wife for making a big deal at the distinction between a canteen and a water bottle
Why was such a thing funny to you?
I thought the way she reacted was really funny.
I'm sure you thought your wife's reaction was funny, but you shouldn't laugh at your wife. It might have upset her and hurt her feelings. You should be more supportive of your wife.
I'm not responsible for her feelings and I'll laugh at her to my heart's content.
Even though she's your wife and you're very close, there are still boundaries you shouldn't push. She was making an honest mistake, and belittling her for it may be painful for her. How about just apologizing and accepting her mistake, and moving on?