I want to just update to ios 8 nothing further?

I have a 8 gigabite iphone 4s. And have not updated it since I got it. The big reason is I don't really have all that much storage. I cleared up enough so that just ios 8 can install. The current version is ios9.1 that I can update to but just want to update to ios8 so I can get some apps.

You will have to downgrade. Google downgrade iPhone 4S and it will tell you how to doo it you just have to get the ipsw for your specific 4S model it should say where. Cheers.