Wearing a mask is the best way to help stop spreading the virus, on top of the other measures such as staying at home and washing your hands carefully. A homemade mask is not a 100% protection against the virus, not even close, but it is good enough to slow the spread. It protects you, and most importantly, it protects others, so less and less people will get it. If you can't buy one, make one, or better still, make more and share. For you, for me, wear a mask whenever you are out.

See: How to significantly stop coronavirus.