I was going to write something about how to make a tag manager by your self, but my parents came in so I'm stopping.
Never mind, I'm back on. Basically, instead of Google Tag manager, you're going to use something called common.js instead. You'll host it on your own server, instead of Google's servers (but if you really want to they have storage APIs for that...)
Anyway, here's the maker:
Include it like this:
<script defer src="/common.js"></script>I may not be able to finish this.
UPDATE: I couldn't finish this, check my next blog post to see what's in mine.