I know some of you guys live in the Midwest like I do. This is an area I know nothing about but I am wondering should I get some kind of case humidifier or some thing for my new Eastman?
I would say "Yes!" especially for the winter months.
The simplest (and least expensive) solution is to put a piece of wetted sponge--wrung out first--inside a plastic ziploc bag with a few holes punched in it. I have also used spent film canisters (remember those?) with holes punched in the top. In a pinch, an old prescription bottle works too (with a rubberband to keep the rig together.
You'll need to do this every 2-5 days depending upon how humid it is, the size of the sponge, etc.
Film canisters! You are dating yourself, sir. 
thank you for the DIY tips!
so don't worry too much Spring-Fall?
Drug stores have a variety of little plastic jars and boxes that are great for drilling holes and filling with sponges. You can make them for 50 cents instead of paying $20 at a music store. They say that humidity should be at least 40%, and you can buy a digital humidity gauge for about $10 at Walmart or such (will pay $20-30 for the same thing through a music store). I try hard to support local music stores; pay a couple bucks extra for strings and such. But this seems to be one situation where you can do it yourself.
Right on...
Yep, I'm aging well I suppose.
I totally agree with Yooper . I support my local store when I can, but humidification can be a real DIY.
Yep, diy solutions work fine.
I do own and use commercial gizmos. There's one from Dampit made for violins which I use in one mandolin. And I have a couple different types in guitars. I have a lot of instruments of different types. I could go broke buying humidifiers to put in each case.
The Planet Waves style humidifier is obviously a sponge in a nicely shaped plastic container. So, anyone can pull that off themselves. Pill bottles, film cans, M&M mini tubes, etc. all work. A walk around a decent dollar store will probably get a few ideas.
Your next question might be, "Do I need a hygrometer?" . Well, yeah! Some cases have one built in. Others may have space for one and a humidifier. Others, not so much. If you have one instrument to protect a case meter will do what you want. If you have a few instruments you can monitor humidity in the room(s) where you play. Again, no need to go to the music store. Many indoor weather stations have humidity features. I use one with multiple room sensors. Otherwise, hit eBay. Lots of solution for humidors and so on.
Edited by - Mandodennis on 04/14/2021 06:28:16
I hate to disagree, but I deal with humidity and humidity instrumentation as part of my job. Most weather "stations"--indoor or outdoor--just don't have reliable humidity sensors; built-in sensors in the case are even worse. Perhaps if your acceptable range is 20%, those kinds of things are fine.
If you want to be within 3-5%, and you truly worry about staying over, say 40% RH, something like this is way better:
https://www.onsetcomp.com/products/data-loggers/ux100-003/
$89 is a small price to pay to protect a $1000+ mando/guitar/fiddle. NFI.
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