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I think initial level is must if you are entering the tour route, at least you can understand the language if you can't speak and if you can speak, there is no major difference if it is poor. You can survive.
According to my experience, it is good to have enough water and food for whole journey when you start your journey, thats the other that you can get water and food along the way. In summer, we need more water compare then other season.
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