I don't know how many gallons of fuel you are talking about.
As has been mentioned many additives for water will try and suspend it in the fuel.
Your location makes my normal way of separating water impractical, freeze and pour.
Many people keep the bottom of thier pickups a couple of inches from the bottom of the tank,
that works for awhile. Then the nasty crap accumulates till you can pull up a good big slug of it.
I prefer to pull off the bottom of my tanks, I use good filters and most of my final tanks have 2
filters inline, one water block and one 10 micron or finer I try to order 5 microns to have on hand.
My home heating oil tank that I installed almost 20 years ago has a 3/8 OD tubing line that runs right to the bottom,
the furnace filters have filtered over a 1000 gallons a year for 10-12 years now it's down to 800 gallons a year,
most years those filters will go 6-8 months before I change them.
The tractor tanks go more then 6 months between changes close to a 1000 gallons.
I need to check the tractor tanks as I don't recall when I last changed them.
All the tanks get a dose of biocide annually.