In reply to goatee:
Coleman Gas you can get at Deportes Sherpa in Calle Paz in Granada or more easy to find is the Intersports on Gran Via in Granada (both are closed usually on Sat afternoon and Sundays) There is also a big Corte Ingles in Calle Darro that is open most days They have a camping/hunting section upstairs where they often have gas but maybe dont bank on this one.
There is a fair bit of snow at present and it will be bloody cold in Feb with -25 windchill not uncommon. There are however some bivvy huts that, if accessible and not buried, can be used
http://www.snow-forecast.com/resorts/Sierra-Nevada/6day/top
http://www.snow-forecast.com/resorts/Sierra-Nevada/webcams/latest
Hut info
http://www.spanishhighs.co.uk/mountain-huts-refuges-sierra-nevada.php
A good little trip is to take bus Granada to Trevelez + walk up to Siete Lagunas (camp spot by old threshing circle by an aquaduct below Siete Lagunas) next day up to Siete Lagunas and climb Alcazaba then back down to Siete Lagunas + Camp (watch out as sometimes foxes can be a problem round here.)
Following day Climb Mulhacen easily from Siete Lagunas descend other side down towards Caldera hut and on to Cariguela bivvy hut underneath Veleta (Could be a long day depending on depth of snow and be careful around Col de Lobo for very real avalanche danger) Climb Veleta in about 30 mins from hut. Its a cold hut but much better than camping
Next day drop down ski run then back up towards Elorrieta bivvy hut(usually full of snow) again watch out for avalanche danger, and continue easily along ridge to Caballo and down to bivvy in Caballo hut
Next day walk out to Lanjaron (feels longer than it should be !)
Eat well in Lanjaron (Bistro 31 is v.good for food + English understood) and get bus back to Granada (try Bodegas Castaneda and the Gran Taberna in Granada as more interesting Spanish bars Calle Navas also has many good bars)
Let me know if you want any more info
Post edited at 20:25