Below is listed some of the kit you may want to have in your canoe. The items near the top of the list are the ones you are likely to need sooner than the ones at the bottom.
PFD or lifejacket (see THIS
PFD (personal floatation device), Buoyancy Aid or Life Jacket is an essential. It is no accident that I have listed this before even a paddle. Going out in a canoe without some sort of personal floatation is asking for trouble. The choice of the style is wide and will be largely down to the type of water you are out on as well