Spices really make cooking fun. They add flavour and authenticity to food. When I am camping I like to have them pre-mixed to save time and space when packing.
So for Indian some chilli, coriander, cumin, garum masala etc.
But remember it is important when mixing to keep the spices to the ratio as suggested on the packaging and mix them well.
For Mexican I would mix cumin, chilli and some smoky paprika. If you have the basics then you can add to the mix.
There is nothing like the smell of your food spicing up the great outdoors.