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To check the alternator output put the multimeter on volts and take a reading across the battery terminals - it should read between 13.5 to 14.8 volts.
The other problem could be there is an electrical drain whilst the engine is not in use. The best way to check is to disconnect the positive lead from the battery and connect the multimeter (set at amps) between the positive lead and the positive terminal of the battery and measure what ampage is being drawn. This should be reading in milliamps. Whilst doing this you can remove each fuse in turn to determine which circuit is draining excess current.
Just double check the boot light and glove box lights aren't lit as they can be easily overlooked.
Currently in madnoel10's garage:
Honda Civic 1.4l