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what about N95 or N99 masks?
okay so: to the other points about disposable masks etc. disposable in this instance is probably better. Because you're going to get cross contamination otherwise. These things are your barrier, but you bring that barrier into your home and then what happens? Do you sterilise it? The rest of this response writes itself...
IMO be sensible: wash your hands properly and frequently, avoid touching your face when out and about.
The rest is luck.
These tend to refer to the medical blue face masks from hospitals, but what about N95 or N99 masks?
(I hear all about the touching face thing)