Most bread will have v little milk in it if any, but we are dairy free and have 50/50 or Best of Both.
If you really need to avoid all dairy, then most cake is ruled out, but if you're desperate look in free from aisle, or bake your own using olive oil or dairy free spread.
Chocolate: look for dark choc 70%cocoa plus but check ingredients too.
Biscuits: ginger nuts are your best bet
Soya yogurts
Soya ice cream - "Swedish glace" brand available in most supermarkets
As for meals, lots of processed stuff usually ok, eg fish fingers, chips, sausages, baked beans, but again check label
Maybe go for a roast tmw, and use sunflower or olive oil instead of butter for spuds and veg? Also check stock cube or gravy granule labels as that's the kind of thing that can catch you out.
Most muesli is ok, as are Cheerios, weetabix, rice crispies, porridge oats, but obv use soya/oat/coconut/rice/almond milk instead of dairy
Hope that gives you a few shortcuts to make it through til Monday, but u probably won't have to be that careful. Good luck!