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Often, a good inspection of the packaging will give you a clue. I think it has to do with the production lines. It is easy to slap a different label on a bottle, but harder for a machine to accept a different size or shape. Also I have noticed a few that 'hint'(with named comparisons on the label!) at who makes it.

Also sometimes the ingredient list can help. Compare two name brands of a product, find the differences, then check the store brand for which one it is, sometimes it works.

In the candy business, we called the product re-bags. The candy was made on the same production machinery and with the same raw materials as the name brand, but packaged and labeled under the off brand name.
My first question was why would a name brand sell to the "competition" and was enlightened by the answer. It seems that the name brand sells the relabeled product under a major contract to the off brand. With the name brand product, they have to rely on vendors, consignments, and on future sales projections. Basically unknown dollar amounts. With the off brand production, they have a definite contract with set dollar amounts. This becomes an asset to the company.

Not saying that Heinz does it, but if they did produce off brands it would show up on the shelves in bottles different from their own.