It depends on what year you have but, in most cases the reservoir should be found under the hood on the passenger side, close to the battery.
No it will not but don't mix it with the orange.
it is the same reservoir as the front windshield. In my 93 the front reservoir also supplies the rear.
Total capacity should be aprox 12 quarts.
The brake fluid reservoir does not have a dipstick.
Check under the battery tray.
It probably called for Dexcool from the factory but you can be safe and just get universal.
Typically a 50/50 mix of clean water and antifreeze will protect down to -34 degrees. Have your local auto parts store test your antifreeze.
An S10 is the same as a Chevy S10.
I'm not familiar with your model, but usually on the vehicles I've seen both the front and back share the same reservoir.
The clutch fluid reservoir is located on the firewall close to the brake master cylinder. You can visually see the level unless the reservoir is to dirty.
Sounds like a leak.
the slave cylinder is bolted to the drivers side of the transmissions bellhousing,the reservoir for it is on tne drivers side firewall