I recently got a little beer brewing kit to use at home with a 4L fermentation bottle. Up until I filled the beer into the bottle I think I've done everything right, but since then I saw no sign of a fermentation process in the bottle whatsoever. I think I used a bit to little yeast. The color, consistency and the overall apperance of the beer have not changed at all and it's been like 10 days now. Is there any way I can save this "beer", for example if I open the fermentation bottle, fill in some yeast and close it again for a week or is this batch of "beer" completely lost?
Thanks in advance for your help.