Live soya yoghurt is incredibly useful. I use it on my breakfast muesli, in smoothies, lassis, fruity desserts and to make frozen yoghurt. I find I find it useful to maintain some live soya yoghurt in my fridge.
However your starter soya yoghurt can be shop bought… however ensure it is a live yoghurt.
In addition to being delicious and useful live soya yoghurt is packed full of probiotic bacteria to help maintain good health.