"Tomorrow, we will buy turkey and veal."

Translation: Demain, nous achèterons de la dinde et du veau.

[Abel355]

Still confused . . When to use "de la" or "du" rather than "un, or une" or "le, or la"?

[John.Orr]

Here you use "de la" because it's an unspecified amount of turkey. La and une would be the turkey and a turkey, respectively which aren't appropriate here