I won’t go over the same common sense lists of materials one should have in their vehicle during Winter travel or anytime you venture off the roadways or deep away from others. These two sites provide those lists: Jungle Training & Safety One International.
No doubt you can provide a dependable cache of materials, but here, I wanted to simply remind you to have the equipment updated (batteries), reachable (not buried in back where you won’t reach it once in a ditch) and have it organized for a real life event. Oh, where in the hell is the duct tape and bungee’s on these lists? Re water containers, remember water containers my rupture in extreme cold, so use a container that can suffer the cold extremes. Extra clothing should be with you whenever you go fishing…right? Go under once and you will remember to have a change of clothing.
An additional thing: in extreme cold, ice in the guides, severe winds….all very cool to be out there waving the rod. But, do you really know how you function in these conditions? Do not waste your core body heat while outdoors. Dress with clothing that can handle the cold. Store the cotton hoodie and cheap cotton stocking cap. To start stumbling back toward your rig and feel that desperate, fumbling feeling is unsettling.
Be prepared once back to the rig to find your keys (what are you going to do if you lost them…a spare?), to open your rig up and start the engine and crank up the heat. You will know if you over did it if you stumble/fumble about in a panicked state. If so, assess then what to improve upon. Clothing, location, duration? Or, forgo the deep freeze times?