Is it feasible for an undergraduate student to write and publish a book in 2 years?

You may be able to write a book in two years (although this sounds like you would have to do extensive research, since your own experience alone would probably not be enough to interest a publisher, so it could take longer), but getting it published can take a long time. If you have something you really want to say, then go ahead - it shouldn't bother you too much if it takes longer. However, if the point is to have this as a selling point on the job market, it sounds like something which may drain too much energy from your academic work without any promise of a reward, and I don't think I'd do it for that reason alone.