Have you tried Silk Pure Almond? Ingredient list is: almond milk (filtered water, almonds), cane sugar, sea salt, natural flavour, locust bean gum, sunflower lecithin, gellan gum.
I guess the gums and stuff are a bit ??? but nothing here is jumping out at me. Then again, I'm new to this whole ingredient-list-reading thing. It might sound a bit "unhealthy" but for weight-gain (I'm going in for surgery in two weeks and need to pack some pounds on with like no visible lumen on CT at my TI, terrified of solids) I've been pouring oil in pretty much everything. It also helps me feel full. Soup broths get two tablespoons of olive oil, tea gets coconut. It really helps amp up the calories for when you're desperate to pack on some pounds - I'm doing 3000 cals+/day. Plus those oils won't screw with your cholesterol...apparently?