Call your local city/county offices to ask to talk to the appropriate people, call your insurance guy, call the fire chief, call your local woodstove or HVAC shop. If you start asking around, people will point you in the right direction. Use treated lumber on/near the floor and bathroom grade drywall (greenboard I think?) it will take high moisture and then leave the bottom of the drywall 1/2" up off the concrete too. Any appliance in the basement are supposed to be up on blocks, at least an inch or two (or more if you have the headroom for it) This will keep them up out of the water for most "floods" especially since you have a basement door straight out to your lower garage, the water can't get too deep! This also allows for a little air flow under the appliance to keep it dry or to drain/dry out after a "flood"