What is the best dry or no rinse shampoo?

i am going on a mission trip in a few weeks and won't have running water or electricity where i'm staying. my hair gets really greasy if i don't wash it at least every other day, and since showering is not an option, i need to use a dry or no rinse shampoo. i have been reading reviews and really can't find one that is far superior to the others. also, i don't want to go paying like 20 or 30 dollars for like a 3 or 4 ounce can because i don't have that kind of money right now.What is the best dry or no rinse shampoo?
if you don't want to pay for the good stuff you should use regular shampoo

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