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Given the tight amount of space already down there, and trying not to screw up the EVAP system. Best option is to add an auxiliary tank to the trunk to stretch out the range. Generally mounted in the trunk and mechanically switched. Pretty common on larger trucks and SUVs - more gas for towing and longer cruising range.
Also keep in mind that you will also add a non-trivial amount of weight to the car. Gas weighs about 6lbs per gallon + all the extra weight the larger or auxiliary tank, hoses, valves, etc. A matter of diminishing returns, sure you'll carry more gas with you, but also make the engine work harder as it has to drag all that extra weight along as well. Overall fuel economy, and not to mention vehicle handing. will likely suffer. Also have to check with local rules as well - some places will not allow you to register the car for highway use if you modify it in this manner. You can only guess at the issue of carrying more fuel that could potentially leak out / catch your car and others in a fire in the event of a collision.
As being able to do it, it is completely doable project - but if it makes sense or is cost effective/worthwhile? Hard to say -depends on how you drive the car, where you drive the car, etc. In a truck, this would make more sense - more options to add additional fuel, higher capacity fuel tanks, tank shields, etc.
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2002 Corolla S, 1.8L 1ZZ-FE VVT-i
2003 Matrix XRS, 1.8L 2ZZ-GE, VVTL-i (RIP)
2009 Matrix XRS, 2.4L 2AZ-FE VVT-i
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