My understanding is that under Biodynamics, ideally you wouldnt need to feed your bees, you would leave them with enough honey to feed themselves. However if you do feed them then the standard recipe is organic white sugar + water + their own honey + chamomile tea + trace of salt. My notes are at the apiary so I'll post up exact proportions when I next pull them out.
I was recently asked what biodynamic approaches to varroa treatment are. Does anyone have any info on this?