install VC++ Debug Runtime Distributable

For testing purposes, you can include the Debug DLLs you need 'side-by-side' with your application. You can find them on a machine with VS 2013 installed:

C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\redist\Debug_NonRedist

When you deploy your app, you must use Release mode distributions. For Win32 desktop apps, use these instructions. For Windows Store apps, you don't have to deploy the CRT as it's handled by the Windows Store.

OP was asking about 2013, but the title is general, so..

I just wanted to point out that in newer Visual Studio releases with the "select what you want" installer, for the debug runtime you need just "tools" or "build tools" (e.g. VC++ 2017 version 15.9 v14.16 latest v141 tools or MSVC v142 - VS 2019 C++ Build Tools, not to be confused with the toolset)

As for where you can find the libs, VS 2015 still has them basically in the same path outlined in Chuck's answer. From 2017, you should have something like:

<root>\Microsoft Visual Studio\2017\Community\VC\Redist\MSVC\14.16.27012\debug_nonredist