No money to pay your bills? Don't borrow money, just don't pay your bills.
You have to pay them at some point, but there are tactics to slow down money flowing out of your bank account.
But FIRST... here are some bills you need to pay on time:
Anything that puts you in breach of contract and puts your business, your home, or your health at risk.
Other than that, most bills can be postponed past the due date without dire consequences.
Look at bills that you owe large corporations, who are used to delays. Telephone, internet, utilities, insurance companies. You may be able to wait up to 60 days without consequences. Let them know when you'll be paying.
Suppliers: Make sure that you talk with them. Make payment arrangements. Don't surprise them. Make a partial payment. Many times your relationship is more important than delaying payment.
Mortgages and rent: Most have a no-penalty grace period. Use it when you need to.
Please, be careful with solo-entrepreneurs and small-business people. They are the last ones you want to pay late.
This gives you an idea of how to get through short cash crunches without borrowing money.
Give me more ideas on who to pay on time and who to pay late in the comments below!