I've been in your position (with less money!) And this is what I did.
Make a list of all toiletries and cleaning products - do you have enough to last the month? If no then buy as cheap as you can. Eg aldi, savers, poundland. Also check things like baking paper, kitchen roll.
Make a list of all food Inc spices. See what meals you can make only buying a few key ingredients. Some meals may be a bit wacky but it's a good opportunity to use up those random things lurking at the back if the cupboards.
Eat as much vegetarian as possible, its much cheaper than meat. Or if you must use meat bulk out with lentils/beans/vegetables.
Use frozen vegetables, still tastes great but at a fraction of the cost.
Look on olio, free app where people offer food/items for free. In my area people collect from tesco, Costa, pret.
Cut out the prepackaged snacks. For lunch boxes I buy boubon or chocolate digestive biscuits. Costs around 50p 2 biscuits per day for the week. Buy big packs of raisins/sultanas and decant into smaller tubs.
Or if you have ingredients Make some fairy cakes or biscuits. As a quick cheap treat sometimes we stick some icing and sprinkles on plain digestives.
Do you have any community kitchens near you? Near me i can pay £4 and get roughly 2 bags of shopping.
Sell anything no longer being used on vinted/Facebook. Might not help this month, but will help you build a buffer for future unexpected spends.
For reference my usual entire monthly food/cleaning/toiletries budget is £260. This is for 1 adult, 2 children (14 & 11) and 2 cats. DH rarely eats at home so I don't include him but he uses toiletries etc just no food. I'm also gluten and dairy free due to intolerances and dd2 is vegetarian.
Plan in a few cheap dinners, jacket potato, spaghetti/beans on toast, pasta and sauce.