I would think you could substitute with vodka.

Bacon-Infused Bourbon
Ingredients
• 1 (750-milliliter) bottle bourbon
• 1/4 cup warm bacon grease
Preparation
• Remove 1/4 cup bourbon from bottle. Pour warm bacon grease into bottle. Cover and let stand 4 hours, shaking bottle occasionally. Chill 3 to 7 days. Pour bourbon through a wire-mesh strainer lined with a coffee filter into a bowl; discard filter. Clean bottle. Pour strained bourbon into bottle, and store at room temperature up to 6 months.

I would think you could substitute with vodka.

Bacon-Infused Bourbon
Ingredients
• 1 (750-milliliter) bottle bourbon
• 1/4 cup warm bacon grease
Preparation
• Remove 1/4 cup bourbon from bottle. Pour warm bacon grease into bottle. Cover and let stand 4 hours, shaking bottle occasionally. Chill 3 to 7 days. Pour bourbon through a wire-mesh strainer lined with a coffee filter into a bowl; discard filter. Clean bottle. Pour strained bourbon into bottle, and store at room temperature up to 6 months.



So you can destroy your liver and your heart at the same time! :yay:
Sounds delish.