Your question is difficult to understand (Not sure what "I cant try anything" means).

Most computer fans will run at 12 volts (nominally), so if you get a fan, and can find another 12 volt power supply - eg the kind that comes with a lot of electronic devices where the supply is built into the plug [ you can use less then 12 volts, it will just spin slower and not move as much air ], you can wire up the fan directly to that 12 volt supply instead of using the computers supply. You will, of-course, need to find a way to join the wires [ soldering iron, solder and insulation tape are simple and effective ]

Doing this on a water cooler might not be a good idea though (current requirements, possible grounding issues)

Your question is difficult to understand (Not sure what "I cant try anything" means).

Most computer fans will run at 12 volts (nominally), so if you get a fan, and can find another 12 volt power supply – e.g. the kind that comes with a lot of electronic devices where the supply is built into the plug [you can use less than 12 volts; it will just spin slower and not move as much air], you can wire up the fan directly to that 12-volt supply instead of using the computer's supply. You will, of course, need to find a way to join the wires [soldering iron, solder, and insulation tape are simple and effective].

Doing this on a water cooler might not be a good idea though (current requirements, possible grounding issues)

Your question is difficult to understand (Not sure what "I cant try anything" means).

Most computer fans will run at 12 volts (nominally), so if you get a fan, and can find another 12 volt power supply - eg the kind that comes with a lot of electronic devices where the supply is built into the plug [ you can use less then 12 volts, it will just spin slower and not move as much air ], you can wire up the fan directly to that 12 volt supply instead of using the computers supply. You will, of-course, need to find a way to join the wires [ soldering iron, solder and insulation tape are simple and effective ]

Your question is difficult to understand (Not sure what "I cant try anything" means).

Most computer fans will run at 12 volts (nominally), so if you get a fan, and can find another 12 volt power supply - eg the kind that comes with a lot of electronic devices where the supply is built into the plug [ you can use less then 12 volts, it will just spin slower and not move as much air ], you can wire up the fan directly to that 12 volt supply instead of using the computers supply. You will, of-course, need to find a way to join the wires [ soldering iron, solder and insulation tape are simple and effective ]

Doing this on a water cooler might not be a good idea though (current requirements, possible grounding issues)