I think the key thing here is claim what it costs, or extremely close. I don't think it is a good idea to guesstimate to be honest, but I do not have time to do separate grocery shopping unless I am doing my batch cooking technique which I haven't been doing religiously since reopening in May. I serve zero processed foods but am not organic anymore. My weekly grocery bill for fruit and veg alone for my daycare kids averages at $60-$70 and can vary dramatically depending on the time of year and the fluctuating cost of produce. I've had a couple of recent weeks at $50 but I'm serving a lot more raw veggies for snacks instead of fruit now. I bake from scratch and freeze in single portions and typically buy those ingredients in bulk when on sale. I also buy my rice and pasta in bulk organic and gluten free because its actually cheaper than conventional this way.
I have been looking into the Walmart and Superstore click and collect. I am a terrible impulse buyer lol I like the idea of purchasing all on line and then hubby picking up on the way home. That way I have separate receipts for daycare groceries and only buy what I need. I'm also starting to serve more vegetarian bean and lentil based meals because my next biggest expense is meat. My son is vegetarian so its no biggy. I don't serve fish anymore as I have children with fish allergies.
I used to have a no expense spared attitude towards my daycare menu plan and served fully organic. A couple of years I claimed very high for food. Now I am constantly challenging myself to buy healthy whole foods at the lowest prices. Such a turn around in my approach since recovering from a year as an unemployed full time student. It's quite satisfying and yes I know this makes me kind of sad lol Means more money in my pocket though at the end of the day and my daycare kids are still eating wicked healthy grub!