Hi Olivia! This is a really good way of getting rid of mindless snacking. Crisps are tricky for me. Technically they're allowed, but I wind up having some every day. What you might do is put them on your plate, treat them as part of your meal, and do your first 21 days to get the habit solid. Then you can reconsider. Essentially, if you can lose weight while eating crisps, go for it, but if you find you aren't losing, be prepared to ditch them during the week.
The official rule re alcohol is to have no more than 2 drinks a day, any day. I don't get on with that either! I don't drink often unless I'm socialising - but if I'm socialising I definitely have more than 2.
Reasonably good weekend - first time in ages I managed to stick to my Sunday as an N day, and moreover, stick to 2 plates on it (a fry-up for brunch and homemade curry for dinner)! I have stayed the same weight since Friday, which is good, but it's 3lbs up on a fortnight ago, which is bad. AF started yesterday so it could very well be bloat, though.