Clustered File Server on Windows 2012 With Local Storage

So I have a SQL Always-On group that requires a file share witness. I want that file share witness to be redundant and since I have no other need for a file server on this network, I'd like to do it with the least number of servers.

I thought I'd set up 2 servers with DFS but this article says not to do that because DFS could sometimes use one server's data and sometimes use another, messing up the quorum: http://windowsitpro.com/high-availability/q-why-cant-i-host-file-share-witness-cluster-dfs-share

So it seems I need a true/real Windows Failover Cluster, set up in the File Server role. The problem is that all the articles I read talk about using shared storage. But shared storage (e.g. a SAN) would require a 3rd server and then again I have a single point of failure (the SAN). And, I'd really prefer to buy just 2 new servers instead of 3. I see I can also use Windows' Storage Spaces as an alternative to a SAN but that requires 3 discs so that's even worse insofar as buying hardware.

What's the best way to set up a redundant file share for a witness without buying too many servers or having a single SAN point failure? Obviously, I'd like to use local storage but can I set up the file cluster so that it uses server 1's hard drive all the time when server 1 is the primary and server 2's hard drive all the time when server 2 is the primary, and use DFS to replicate data in case one of the servers died? I think this way would avoid the "only DFS" concern mentioned in the above article and still keep me at just 2 servers.