Prepping

You can live off oatmeal alone provided that the duration you only eat oatmeal is not too extended. Oatmeal cannot sustain you long term by itself; you would need to supplement it after a while with other foods to get a sufficient energy-rich nutritious diet that will sustain you with enough energy for survival.

It is definitely possible to survive on rice and beans alone, since the meal is considered to be a complete protein, providing all 9 amino acids that are essential to life. The carbohydrate value of rice provides a good source of energy. Rice and beans partnered together will make a survival food that can sustain you indefinitely if you can stand the boredom!

All dehydrated foods will expand to some degree in your stomach. The degree to which they expand will depend on the dehydration process and the type of dehydrated food. It is, however, unlikely that the extent of the expansion will be the cause of any health concerns other than a little bloating.

You can eat a dead chicken provided it hasn't been dead for too long, and you can establish the cause of death with some certainty. Some circumstances that resulted in the death of the chicken may render the carcass unfit for human consumption and may be more of a danger to your than hunger.

The optimal edge angle for a machete depends on what you use it for. Whatever the angle, the blade needs to be maintained to the point that it is sharp enough to shave with but still with enough metal behind the edge to support the impact of heavy blows.