Bringing a lid to a knife fight works fine as long as you don’t forget to bring a knife as well. It goes in your off hand to use as a shield.
Good point. Also, depending on the gun, water to a gun fight could be a good way to stop the gun from firing
What if it’s a squirt gun fight?
Then you’re either equally matched (you brought water in a squirt gun) or you’re outmatched (you brought water in a bucket, only good at close range) or you’re the clear winner (you brought a firehose)