Firstly, what great writing.
This list, I presume is for two people, maybe code named D and W? There is some mixture of upper and lower case writing and the common grocer’s apostrophe.
Crisps, beer, wine, D|ginger, bread, D|W|Tablets, oxo’s, chicken oxo’s, washing liquid, fruit, veg, curry sauce, rice.
In answer to the question, what is Oxo:
Found Sainsbury’s, Calcot, Reading
15th September 2016