I don't think it's that difficult to find good, reliable content on Twitter.
1. Follow people/companies/news sources you rely on
2. Lists are awesome too
3. Learn how to make good use of the search box in Twitter. There are some symbols (+, "", – etc.) that can help you narrow down your search.
4. If making your own Twitter lists takes time, follow lists made by thought leaders in your field.
Hope these help.