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I highly doubt that’s a China specific issue. Far too many politicians have additional ‘jobs’ as consultants, speakers or a seat in a supervisory board. At least in Germany it’s unfortunately quite common, especially in the more conservative parties, to have additional income that exceeds your regular salary as a representative.
You can search for vegan trekking food. There’s plenty of brands selling convenient products (e.g. trek n eat) where you just have to add hot water. But you’ll also find many recipes to prepare such meals youself.
Some inspiration: cous cous, instant pasta, powdered hummus (must be made from roasted chick peas as raw ones are toxic), tomato soup. For protein you can add nuts, seeds etc. If you don’t care for the weight, you can also buy pre-cooked rice etc. and just add an instant soup to heat it up.