In my neighborhood this is already done sadly. Though its not called a shower the teacher just sends out stuff they need for the classroom. And my wife and I are happy to contribute but it does suck feeling like we need to spend an extra $200 because the school won't Pony up the money.
That's not even getting into the extra school supplies they put on the required list for students in case another student can't afford supplies so that there's enough for everybody.
Remember it's not the school that won't pony up, it's your local and state government that aren't giving them an appropriate budget.
Also keep in mind that most grant money comes with stipulations. I remember many years ago (late 90's or early 00's) we got a big grant for computers in the classroom. Good chunk of money. But it had to be spent on computers, and only computers. Would have been nice to get some furniture to put them on. We had some in the back of the classrooms next to the sink, some we put 2 desks set front to front (it was not level) It was janky, but the computers were nice.