CDC Website
Use the "CDC A-Z Index" OR the searchbox to find some statistics/data related to these topics on their general CDC pages -- each topic often has a section with statistics/data:
- Traumatic Brain Injury & Concussion
- Teen Pregancy
- Opioid overdoset (also just search OPIOID to see other related info)
- Water, Drinking (see the subheading "Public Water Systems")
- Antibiotic/Antimicrobial Resistance (see the "AR Threats Report 2013" for some stats)
For Food Insecurity - also search: food security, hunger, - in the search box AND search the USDA website for food security -- as they are the agency that deals most with this issue.
For Gun Violence - search the CDC site and GOOGLE it too (include US in your search). Remember to apy attention to the source (who are they and what is their agenda).