Never, ever, ever have liquids anywhere near the fryer. You know the sizzling that you see/hear when frying chicken in a skillet? Thats just minute amounts of moisture. Spill a glass of water or an ice cube in there and you'll have what can only be explained as an explosion...of hot grease. No one in my kitchen is allowed on the line with liquids of any kind. Also, you should already have a small fire extinguisher in your kitchen. They're cheap and when you need one you need one.
I've had four grease fires over the years at home (none from fryers, and yes, all were avoidable). The second one required the help of the big red truck. TIP: don't leave a grease filled cast iron skillet inside the oven and turn it on self clean!!
Please re-read TIP.
Yes, I really did do that. Don't remember if I was drinking or had a hangover, but probably one of the two in those days. I no longer drink. ..<[ : ^ ) Dumbest thing I ever did, had my head up my (well, you know where) and went after a french fry at the bottom of a 365 degree fryer. Don't judge, I only did any of these things once.