I used to work for one of the major supermarkets and am aware that there are providers of product images, but don't know the specifics in enough detail.
A lot of business try and claim copyright of a subject (like a tourist attraction) and try and prevent photography of it, but that’s legal BS in any jurisdiction I’ve heard of.
You could of course get images from some other source - but you need meticulous organisation when a single brand of tea might have 40, 80, 160, 240 and 600 bag packages.
Whether you can use those images commercially is another matter entirely.
See here as an example: https://www.brandbank.com/content-licensing/
So for instance you could scrape a website that licenced images from brandbank above, and then fall foul of their copyright.
Brandbank as an example does work with UK supermarkets, e.g. see below:
https://www.brandbank.com/tag/sainsburys/ https://www.brandbank.com/tesco-case-study/