Usually the plastic holding a washer bottle will not accept epoxy very well, and if it does it may not be for long, as well as most urethanes. You can take the splash shield out but you will have to have a couple swivels to get into the right spot. The washer bottle itself bolts to the apron of the car. If the bumper is off the car, which isnt tough to do, you can get right to it. Taking a bumper off the car is a good thing to know, once you do it, you will open yourself up to a lot of knowledge, especially if you ever want to replace the radiator/condensor.
Take your time, label the bolts, and you will have no trouble at all. I would put it in the difficulty of doing brakes. Once you have done a set, you have the general idea and everything else seems do-able.
Good luck to ya