Saving tomato seeds is a little different from other plants, but it’s so easy!  Simply cut your tomato in half and squeeze out the seeds into a jar.  Once your seeds are finished add a few tablespoons of water to the jar.  Place a coffee filter over the top and secure with a rubber band.  Let this sit in a warm place for 3 to 5 days.  It works faster in hot weather.  Once done, skim the scum off the top and pour the seeds into a fine mesh strainer.  Rinse them well and spread out on a dry coffee filter. Leave them for a day or two, then scrap them off and onto another dry filter.  Let them sit for a week or two, to fully dry. Then package into paper envelopes and store in a cool place.  If you would like to keep them in jars or plastic baggies make sure they are VERY dry so they don’t start to mold.