Mix the first four dry ingredients together in a bowl.
Rub pork tenderloin in dry seasoning mixture.
In a large saute pan heat oil, 1/4 cup balsamic and garlic on medium heat until hot.
Add pork to saute pan and sear, browning meat on all sides.
Reduce heat to low.
Transfer pork to slow cooker.
Pour remaining balsamic into pan, with water continuing to stir for a few minutes to de-glaze pan.
Pour juices over the top of the tenderloin in crock pot.
Cook on high 2.5- hours or until internal meat thermometer says 170 degrees.
Let rest 5-10 minutes then slice.
Serve or return slices to slow cooker and keep warm in the juices.