changing the filters and adding power service (white bottle, not, repeat not, gray) should do it ...sparing the filters is a must ...and, while you are looking for power service in the white bottle, look for the orange '"diesel 911" from same manufacturer ...keep a bottle on hand.
I'm not familiar with your tractor, but if one of the filters is at the lowest point in the fuel system, that is where water would show up if there is any ...is there a glass bowl to inspect? or, a drain cock ...if the latter, drain a cupful, or so, into a clear container and look for a water bubble in the botttom ...if you find one, you might regularly drain a little fuel, there ...and consider reviewing where you got the fuel, when, and how you put it in the tank. If there is water there, I would drain the tank and refill with known good fuel or "polish" the fuel you took out.
A trick I have found is that if you are pumping or siphoning from a fuel can into your tank, cut the inlet/pickup tube of the pump/siphon on a bias so that it can't suck up the dregs ...which is where water would be if there were some in the fuel.
And, of course, now is the time for "winterized" diesel fuel or #1 (straight, or you can make a winter blend, yourself) ...As others have mentioned in the other threads, kerosene is an equivalent blending fuel, but I would be doubly careful about it's quality.