Heinz bottle blueprint, say

KETCHUP SKETCHUP

["Think of a popular condiment brand paired with a 3D modeling software—both share a key word that sounds the same but spells differently."]

This clue plays on the idea of a "blueprint" for a Heinz bottle, which famously contains ketchup. "Ketchup" sounds like "SketchUp," a 3D modeling software used to create digital blueprints or designs. The answer combines both words—"ketchup" for the Heinz product and "SketchUp" for the blueprint—to form a punny, two-part solution.