2002 Liberty leaking a small amount of red fluid on garage floor. I'm thinking water pump since the water level dropped some?

Check the radiator fluid level. If the smoke is not present when it is first started, and after a short time later it begins to smoke, it may be a blown head gasket that is letting radiator water into the combustion chamber. The symptom of, "not revving as usual", would be an inconsistent engine speed at idle. If the fluid level is going down in the radiator, and you don't see fluid on the ground, with the exception of a small drip out the tail pipe when the engine first starts, a small amount of water in the combustion chamber will cause a lot of white smoke. It can be normal for a small amount of water to drip from the tail pipe, depending on humidity, but once the engine is warmed up, the, "white smoke", should not have moisture in it. A paper towel held at the tail pipe for a few seconds should not get wet after the engine is warmed up, and the radiator fluid level should not decrease if no fluid is leaking on the ground.

There are only a few ways coolant can get out of the cooling system.
First check where the hoses connect to the radiator to make sure they are completely dry. Then check directly under radiator to make sure it isn't damp. Sometimes the radiator cap will go bad and allow some coolant to leave. You can replace the radiator cap relatively cheap. The very worst way you can be loosing coolant is thru a blown head gasket. The coolant slowly leaks into the cylinder and is burned. You would have to go to a mechanic to have this verified.

so what was it.
bad mech. service (sure was)
or bad head gasket
or bad water pump.>

There seems a distinct possibility your suspicion is well founded...

Fluid quantity is usually quite small so a small leak will soon result in a drop in the level. It isn't unusual for a steering rack to appear wet and oily from a "sweat" or two without actually leaking and there might even be a drop or two of fluid gathered there but it should be obvious to an experienced mechanic what is a leak and what can be ignored.

It is possibly a coincidence and the rack began leaking suddenly during the test but such a leak would be obvious by a fairly constant dripping and a clearly visible oozing of fresh fluid.

The presence of a serious long-term leak is indicated by a distinct lack of road dirt around and below the leak site as the constant flow will wash it clean - and of course the reservoir will need regular topping up.

Sounds like it clutch master cylinder or brake master cylinder/ booster is leaking. Check your fluid levels.

you may just have built up snow or slush that is melting when in your garage or you may have a leaking hose or water pump keep checking the antifreeze level and if there are no changes then its just snow and slush thats melting.

small amounts aren't a huge deal. Depending on where it's coming from, it could be something simple that you won't ever have to deal with, or the beginnings of a serious problem. Bottom line, these transmissions are good for about 200,000 miles if they're taken care of, and probably 170-180000 if they're ignored. It's time to worry if/when you start seeing a significant amount coming out, or the transmission slips, or acts up in some other fashion.

This may be the first sign that your water pump is failing. First sign is a leak. Crawl on your back under car if you can see if you can see it coming from front of engine near a pully that would turn your water pump. There is a "weep hole" it may be driping from.

If it's red, it's transmission fluid. Coolant would be green. Check the fluid level, don't let it get low, Chrysler minivans are prone to transmission troubles, and low fluid levels over time will ruin a a transmission. And be sure not to overfill, it's just as bad for the trans. Have the leak checked out and repaired, good luck