How can one remove water/condensation from a watch.?

I had the same problem once. I had the back plate removed and resealed. It didn't work, though. Mine would steam up on a hot humid day. I eventually replaced the watch.

you can use something called silica crystals! I know my dad us to use it when we were kids! Was great

try putting a blowdryer on it

put the heating on very low and keep the watch on top of the radiator but keep turning it every so often, it will take a few days out but it does work as i did it to mine.

I don't think there's anyway to do it yourself unless you know repair watches and what you're doing. You can get the water droplets to not form on the inside of the glass by not wearing the watch and leaving it in a cool dry place. It should clear up in a couple of days, but as soon as you wear it your body heat will warm the air inside the watch to a higher temperature than the outside air and the temperature differential will cause the moisture to condense on the glass. It sounds like the waterproofing seal on your watch was damaged in some way (by someone changing the battery for instance, and not being careful while doing it), or it has simply degraded over time. You can on the short term get the water to dry out inside the watch (ie: with silica gel), but if the problem with the seal isn't sorted then it's only going to happen again. Take it to a watch repair shop, preferrably one that is authorised to service your make of watch. Check if it's still under warranty. If not, depending on the actual cost of your watch the repair shop charges may end up being more than the cost of getting a new one.

Keep it in sunlight for sometime.

I can have this problem with my Seiko quartz from time to time. I just put it on top of the hot water heater for a while and the condensation goes away.

if it is still working take the back off and let it dry out, or take the top glass off and let it dry out. Watches are not water proof, they are water resistant, to a certain depth

i accidentally put my mobile phone in the washing machine and soaked it thru. i found that wrapping it in socks an putting it in the tumble dryer worked well. it worked perfectly fine after that