How about we meet in the middle.
If you can provide a receipt for accomodation/rent and utilities, you are eligible for the UBI up to the value of your accomodation and utility bills (with limits).
The UBI can subsidise classes of certain foods up to a certain value if you keep the receipts, but can not subsidise confectionary, soft drinks, smokes and alcohol. Only fresh food, milk, etc. with a nationally recognised UBI code on the packaging can be subsidised.
The UBI is not money that you can spend on barista coffee, lego, computers etc. You need a job for that. It’s a tax return for living that’s claimable each month and doesn’t rely on actually paying tax. Processing the UBI creates jobs and encourages people to organise their spending. But in this manner, any reasonably organised person can get off the streets or bootstrap their own business without anxiety about starving.
Social services would help people with low means (ie can’t read or write) to organise their affairs to make use of the UBI. Benefit payments for unemployment and for kids would be suspended. Naturally, taxes would be increased to support the UBI, but most of the cream that you make could be used on “nice” things.