I am a whitewater kayaker and my GF, who does not kayak, sometimes accompanies me on river trips. She loves the outdoors and is never bored when I am boating (besides driving my vehicle from the putin to the takeout, AKA "shuttle bunny") but she has mentioned that she wouldn't mind to do some trout fishing.
While the water level needs for kayakers (higher flows) are different than for fishermen (lower flows), some of the rivers I paddle are dam released, IOW, the basic flow is low and then the dam releases, injecting a necessary flow for kayaking for a few hours, then it is low again. So it could work out that she could fish on the same river where I am boating or find another stream with (stocked) trout nearby.
My question is, what is the basic setup for trout fishing with a spinning rod (which would be more basic than fly fishing)? What size of rod is optimal. Our rivers/creeks are mostly smaller (e.g. 30-100 ft across, 300-1400 CFS) with some rapids and some swimming/fishing holes in between and lots of trees around (which makes fly fishing less practical). What kind of bait and test lines? Other equipment?