It's primarily just chilis. From the bottle:

Chili, sugar, salt, garlic, distilled vinegar, potassium sorbate, sodium bisulfite and xanthan gum.

Remove the last 3 ingredients then just shoot for texture. for any given bottle, probably 75% chili, 10% vinegar, salt, sugar, garlic for the last 15%.

If you can match the consistency, you can probably match the flavor. You just need a line on fresh California Red Jalepenos.

I'd probably throw out the salt and just go for MSG.