Topping up after first week

[Imperial207]

Getting ready to do my first batch of mixed fermentation beer. I want to skip using a primary bucket and just keep in glass carboy. So I am curious if I don't want to attach a blow off tube, can I just add water after first week or so of vigorous fermentation has stopped? I'm planning an extract brew of 6 gallons to be split in a year, half raspberries, half blackberries. I have done some research but can't find a good answer..

 

[alexmkuyper]

You certainly can. I would recommend using distilled water and even boil it before adding. You could also add some low gravity wort to top to reduce the oxygen pick up.