Looking around my refrig, you might check "Organic Edensoy Extra" in 8.45oz/250ml aseptic boxes. It does list "naturally malted organic wheat and barley extract" which might be a sweetner. You could also get the larger boxes of your fav non-sweetened and ice them in a cooler after opening. I've made large camp scale French toast with soy milk, fake eggs and cinnamon, walnut raisin bread on playa.
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