From the Document: "Because many people who are homeless are older adults or have underlying medical conditions they may also be at increased risk for severe illness than the general population. Health departments and healthcare facilities should be aware that people who are homeless are a particularly vulnerable group. If possible, identifying non-congregate settings where those at increased risk can stay may help protect them from COVID-19. [...] Many of the recommendations to prevent COVID-19 may be difficult for a person experiencing homelessness to do. Although it may not be possible to avoid certain crowded locations (such as shelters), people who are homeless should try to avoid other crowded public settings and public transportation. If possible, they should use take-away options for food. As is true for everyone, they should maintain a distance of about 6 feet (two arms' length) from other people. They also should wash their hands with soap and water for at least 20 seconds as often as possible, and cover their coughs and sneezes."
Centers for Disease Control and Prevention: https://www.cdc.gov/