Divide the pecans and vodka between 3 jars. Divide the nuts among 3 (16-ounce) canning jars. Add 2 cups of vodka into each jar and make sure the nuts are completely covered in vodka.

Seal the jars and add to the Instant Pot. Place the lids on the jars and seal finger tight. Set the Instant Pot's trivet in the bottom of the insert. Place the jars on the trivet with equal space around them.

Add the water to the Instant Pot, seal, and cook on high pressure for 60 minutes. When the cook time is up, allow the pot to naturally release its pressure for at least 1 hour or longer.

Remove the jars of extract and cool completely. Use tongs to transfer the jars to a towel or cooling rack to cool completely before storing.

Use your extract within as little as 24 hours, but you can also wait, as the flavor will intensify within a week. Store in a cool, dark place.