"I think the tea bags and bouillon cubes are a cheap way for kit manufacturers to cater to your psychological needs, not your “real” physical needs.". . .

In any survival situation the first thing to be done is sit down and take stock of your situation, a mental or psychological activity to be sure.

Just as a well trained, well fed, well honed body performs at or near its peak ability, so to will a psychologically stable mind perform at its peak ability.

Perception is everything. If the mind percieves fear, the body responds with flight, or fight. The stomach growls and the mind percieves starvation and begins the process of conservation, whether it needs to or not.

Would a hot cup of tea or boullion broth say to the mind 'all is well'? Perhaps. The mind is a funny thing.
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"I'd rather be lucky than good any day!"