Hiya

Where abouts in Tenerife are you going to if you go to Mercadona in costa adje by San Egueno shopping centre they sell a wide range of baby milk and it is cheap too
that is if you are in Playa De las Americas, there are not that many supermarkets on the patch though which is Veronicas, Mercadona is on the way to Aqua land which I can really reccomend if you like dolphins as the entry is well worth it just to see the dolphins

Hope this helps
Email me on Katrinawaite@blueyonder.co.uk I went to tenerife in July, Oh and dont use avon sunscreen it is no good for the canaries,

Kate