It won't help this month, but go through the calendar and figure out when this will happen again. Dh used to get paid 2 weekly so we had issues where he got paid 3 times in the assessment period so I saved and budgeted accordingly.
Also look at all your bills, what can you cut out for future. TV subscriptions, Spotify, gym, charity donations etc. We don't have a TV license, just use amazon and disney plus. Ring up and get a cheaper deal on Internet. Switch to sim only deals for mobile phones.
But this month make a list of everything you have in the freezer, cupboards. Then use those to really stretch the money you have. Eg oats and/or lentils can be used to bulk out bolognase, chilli, shepherd's pie etc.
Download olio, near me there's so much free food. If you have a lidl nearby see if you can get their waste not £1.50 boxes, from memory you have to get there very early but I always got great stuff.
Do you have a community kitchen near you? We have one where you pay £4 a week and you pretty much get a basic shop (roughly 2 shopping bags worth)
Can you visit supermarkets in the evening when they reduce stuff. Meat can be frozen and vegetarian/bakery bits can be used for a few days. Eg there's always stir fry veg so with some cheap noodles and a sauce or soy sauce it's a nice cheap/quick meal.
Frozen and tinned vegetables often work out cheaper. Avoid prepacked items. Rice is very cheap and filling, we eat alot of lentil dahls, chilli's, curry's. On a really skint week we've has baked beans on rice with a sprinkle of cheese/chilli sauce. Before dd was vegetarian I used to make a pie which was baked beans, fried off sausage meat and onion. Then a hand made pastry or mashed potato lid.
To get you through you might want a few treats, especially if you have kids. Some cheap things we make from store cupboard ingredients. Homemade jam/marmalade tarts if you can make the pastry too. Flapjack - cheap butter, golden syrup and oats. Cornflake cakes with cheap/leftover chocolate. Rocky road - any leftover dried fruits/nuts, biscuits/cereals and marshmallows with a cheap bar of melted chocolate. Or you can buy cheap packs of digestives and stick a bit of icing on top. Ice lollies using squash/cheap lemonade/coke.