I've got a small waterproof pelican box which will hold my S&W Model 66, my phone and my extra set of car keys. The first two rounds of the Model 66 are .38 Special Shotshells for snakes.
This is carried inside my canoe bunge corded to the inside.
Is it great for quick draw? No.
Have I ever shot a snake with the shotshell - yes but not while in a canoe.
I like having the pistol with me and not leaving it in the car. I sometimes tent camp from my canoe and I like having the pistol with me.
The waterproof pelican box does not draw any attention and it is there if I need it.
Where I live we have gators, snakes and reprobates. I worry more about the 2 legged reprobates than the gators and snakes.
I canoe in cargo shorts and if I ever need to carry, I pocket carry.
I have on occasions pocketed carried and the S&W 66 got damp but I just cleaned it when I was done. No harm, no foul.
I'd have no issues doing the same with my Glocks.