-The Survival Tabs can be used as a daily sole source food if necessary. However, they were designed with the idea that there would be other foods available either from one’s own stocks or from the land, i.e. wildlife or fruits and vegetables. With this in mind, the The Survival Tabs could be used to fill in when things were lean. Nonetheless, they can sustain a person for an extended period of time. How long, depends on many factors, including the person’s constitution, mentality and activities.