Water and energy are discussed briefly:

On the surface, vast quantities of hydrocarbons in solid and liquid form lie ready to be used for energy. Although the atmosphere lacks oxygen, water ice just below the surface could be used to provide oxygen for breathing and to combust hydrocarbons as fuel.

Travel difficulties aside, endless piles of hydrocarbons lying around ready to be used by people who don't need to wear pressure suits sounds like a good reason to go to Titan instead of Mars... But I get the feeling that the authors are way too optimistic about humans surviving on Titan with "warm clothing and respirators".