Unless you are sick or a medical professional I wouldn't worry with a mask at this point-hand washing for sure. The N95 or surgical mask do slow the spread of disease, but not by being small enough pore size to block a virus but by stopping the airborne droplets which carry viruses The N95 filters larger than 300 nanometers particles and a surgical mask above 5000 nm. Now most viruses run 20-100 nm (there are megaviruses that are larger) so it can block bacterial and some airborne droplets but not an actual virus. Studies show little difference between efficacy of the fancy respirators to a surgical mask. Airborne droplets range from a cough or sneeze range in size from 1000 nm to 1,000,000 nm-smaller (10,000-100,000 nm) travel farther and remain airborne longer. Coronavirus is about 125 nm in diameter. Anyways you could use tight knit layers of fabric, a layer of meshed cotton, or air conditioning paper filters that range 3000 nm, and make effective mask push come to shove. It's about impossible to filter viruses in water which produced the discovery that about all In Vitro maintained cell lines were infected with various viruses-so it's taken some time to produce virus free cell lines. Viruses are an inescapable part of the biome. We are covered and infiltrated internally with viruses and each human has a unique virome-varies time of year and from past exposures."Viruses are, in fact, much more than regular parasites. They are by far the most dynamic and abundant entity and the greatest killers on the planet, as well as the most effective geo-transforming genetic engineers and resource recyclers, acting on all life strata in any habitat". In people with no illness or health concerns half of those tested have viruses in blood, cerebrospinal fluid, even in breast milk. Certain viruses are also integrated into the human genome as proviruses or endogenous viral elements-and certain viruses associate with cancers. So beside pathogenic viruses we are saturated with viruses we know little about it. Generally viruses outnumber bacteria 10:1 and we have more bacteria in our gut alone than all cells of our body-so viruses outnumber both bacteria and our own cells. An alien would think like the Matrix but humans are just feeders for bacteria and viruses LOL. Unless your aged and have complicating health factors your risks of death from the virus is low.