Do I need an LLC, do I need a new bank account, and do I need any permits regarding a shopping delivery service?

Question Details: I'm a college student looking to start a specifically kosher grocery shopping delivery service with some friends. We were wondering if we can start the business without an LLC to get a feel of the market for it, and test out prices, technology and net revenues. Also, if we are being paid online instant payment service would we be able to keep track of the money with the help of an accountant and lay out the money for the grocery trips ourselves? Initially, it will just be the founders completing the deliveries, which is why we wouldn't mind laying it out. Also, are there any certificates or permits we would need from the to start a business in this realm?

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