Hindi lessons - the one

I've heard a few people mention to me that in Slumdog Millionaire (no, I still haven't seen it) that the kid at one point has a job where he is a "chai wallah". So I thought I would give a bit of a Hindi lesson about the word wallah (or wala - you can spell things how you want here). Wallah means "the one" so since chai means tea then a chai wallah is the one with tea.
Aside: yes, chai does mean tea so when you order a 'chai tea' you are ordering a 'tea tea'.
Anyway...there are several jobs here that follow that same logic. Like the people that do the laundry are the laundry wallahs - I forget the Hindi word for laundry. My favorite is for the milk sellers because the word for milk is doodh which is pronounced like 'dude' so they are doodh wallahs and that is just fun to say.
However...the word wallah also extends into things; like if you are looking at some shirts and you want the red one you say "lal wallah", and if you are buying water and you want the small bottle you ask for the "chotta wallah".
All in all it is a very useful word. There is also a way it can be used in a verb tense but that is a whole other story.
In order to get by here there are really only 4 Hindi words I really need:
Kitne = how much or how many. I use this all the time at the market
Jana = the infinitive of 'to go'. So when I get in an autorickshaw and say I want to go to the area of town called Saket the driver will almost always look at me and say "Saket jana?" as confirmation
Chalo = lets go. This is useful when people are moseying around and need to get moving. Kind of like Vamos.
And of course, wallah.
And that is my Hindi lesson for today. All you really need to get by.