What are two examples of indirect water usage that get a car to start? I know really nothing about car engines, so I don't know what parts of cars use water, or how they use it. Thanks for explaining this.

Since this is not my area of expertise, I searched Google under the key words "car engine water" to get these possible sources:

http://www.whatprice.co.uk/car/maintainance/car-cooling.html
http://www.popularmechanics.com/how_to_central/automotive/1272386.html
http://www.associatedcontent.com/article/351852/power_efficiency_for_your_cars_engine.html?cat=27
http://en.wikipedia.org/wiki/Water-fuelled_car
http://en.wikipedia.org/wiki/Engine_cooling

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.

I hope this helps. Thanks for asking.