If a host offers you a drink and you are the guest, you leave a little drink at bottom of the glass as etiquette. Is this considered wasting food ? Is it a sin ?
Wasting itself is haram even if its a little bit or not, its because there is people that cant afford to buy or got the same luck as us (Alhamdulillah) to have Food, water and many other things. I'm sorry if I said something wrong but this is what I think about this subject. This is how we do it in our family we dont waste food at all