There is a small Spar in La Caleta, ideal if you are on foot. 

But if you have a car i would recommend the newly built Lidl next to the Trebol. The latter is not that appealing imho. Just above the roundabout there is also a Mercadonna. But my favorite is the Hiperdino in the Galeon Shopping Center in Adeje. 

May be you need more then food only, then SiamMall is not a bad option. Exit Las Americas.