How much toothpaste do you think you need to store to be able to say you have a full years supply? What about soap? Or shampoo? Or deodorant?
That answer will be different for each individual. Children tend to have a harder time judging amounts to use. Teenagers are more self-conscious and will use those items more often than others. Adults tend to have developed habits and routines that are specific to them. So which category do YOU fall into?
Since these things are hard for anyone to give a definitive number recommendation, take the opportunity now (while we're not pressed with a sudden emergency) to time your products and your usage patterns. Take this list of items, choose your favorite brand and size and then use a permanent marker to label the container with the date you open it. Then use as normal.
- Soap (liquid soap stores easily and is easy to label)