is there anyway to do it without dissambly and getting all of the water out?
You have to get the water out or it will be really hard to braze. Once the water is out braze it with a lead free solder. Any other way would be too much work.
If you are talking permanent the answer is no. You can't solder if water is in there. If you just want to stop the leak temporarily and re-fix it if the temporary develops a leak - there are some epoxies made for that kind of service They will mix into a putty that can be put onto a drippy pipe.
shut the water off-open all faucets to drain-hold torch on fitting till hot and water is evaporated from heat and try filling around joint with solder and it Might fill it in.if not then go from there
