Finding and buying clear face masks and shields can be a challenge, and people are making their own. Check with your employer or school on whether homemade masks meet their health and safety rules (also review the CDC standards on cloth face coverings).
Check out this comprehensive list of tutorials and DIY instructions for creating clear face masks. Some institutions are also using 3D printers to make face shields. Consider providing face masks or shields for service providers for use when working face to face with students.