The JavaScript file for the Twitter widget only needs to be present in a page once—every widget, multiple Tweets and timelines will all be rendered from the same widget file. If your CMS won’t let you paste <script> tags into your content for security reasons that’s OK, but you need to include the script somewhere else in your template. The script you need to add is simply:
<script async src="https://platform.twitter.com/widgets.js"></script>
Then you can just paste the regular timeline or Tweet embed code, but ignore the <script> part.
Hope that helps,
Ben