I find planning is really good for no spend days - often follow the thread for January no spend month on here.
I am cutting right back presently as just had a few big outlays and managed.
I plan my shopping and buy extra milk etc and freeze, this negates the popping to the shops for a pint of milk and spending £20 in the process.
I meal plan so we have takeaways, Friday fish and chips, so no need for takeaways but don't feel like we are missing out.
Its Heritage weekend this weekend, so many places are free to visit and next weekend. Armed with a picnic having checked which National Trust are free tomorrow we will have a free day out.
I also found a barcode for free NT visit up to the end of the year, so another free day out between now and then
We do homemade pizza topping and film night, home made popcorn
Baking afternoons and picking blackberries, finding apple trees in the hedgerow so we can make free puddings
This way I think we feel we are still having pleasant activities but not spending any cash.
My first place for looking for items is now market place and then eBay, before I hit amazon