A hire car is essential for your stay at Casas Almorós. There are lots of car hire companies to choose from at both Alicante and Murcia airports. We have always taken suggestions from Martin Lewis at http://www.moneysavingexpert.com/travel/cheap-car-hire . He suggests the best places to look for good deals, as well as pointing out some of the potential pitfalls to watch out for e.g. be clear on the fuel policy.
One piece of advice we would give is book your car early. We have learnt from bitter experience the cost of booking late. Prices soar and the car companies have been known to run out of cars.