I really need to start doing some painting from life of landscapes and outdoor scenery to get a better grasp of light and color. I know that nothing beats painting from life, so it's time to get outdoors. I've tried to look up info on plein air oil painting and have looked through some of the threads about it/outdoor painting on the forums here as well, but all the equipment and supplies needed to set up for it seem really expensive and difficult to carry around. I unfortunately don't have hundreds of dollars to spare buying easels/pochade boxes/tripods, and I also live in a country where traveling anywhere to paint means lugging everything around with me on crowded public transportation for extended periods of time, which rules out a lot of equipment.
Is there a reason that I can't do watercolour painting instead of oil painting if I'm going outside to paint for the sake of studying? It seems like bringing everything needed to paint in watercolours outdoors is a lot cheaper and easier to carry around and maybe wouldn't even require buying things I don't already have, but I only ever see people posting about doing oil painting outside. I get the impression that I must be missing something if I don't use oils outdoors, or that watercolours are somehow inferior--otherwise I'd see just as many people posting about painting with them rather than oils for practice, right? Is that the case? If so, what am I missing out on/why is it best to use oils?
If it's imperative that it's oils or bust, is there a poor man's way to git-er-done? I don't mind if I can only do really tiny paintings or I'm limited in what I can do or things don't go as well as if I had the proper supplies, as long as I can find a way to at least get out and do it.
Any advice or information would be greatly appreciated!
(Before you tell me supplies really aren't that expensive and I should be able to afford them all, please keep in mind that the price of art supplies in your country=/= prices in my country)