We use rice milk and almond milk. I like almond milk far more but it is significantly more expensive. Worth reading the packaging on these as some have far more additives than others.

Most pre-packaged biscuits etc have dairy in them so for us it's more been about getting to know what doesn't have dairy - 'nice' biscuits, choc-ripple biscuits, corn cruskits. Most dips do, but Yumi's brand don't. We just buy baker's delight or local bakery bread to avoid dairy and preservatives - if you've got behavioural issues, 282 in most commercial breads is well worth avoiding.

DS loves the soy yoghurt but it's so high in sugar and relatively low in probiotics that now I only give it as a very rare treat and sprinkle probiotics into his cereal or a fruit and almond milk smoothie.

It takes a while to adjust, but we're so used to living non-dairy now that I find it pretty easy to work around.... unless we're eating out or at other people's houses. Then you often need to go even more prepared than usual! Good luck and feel free to PM with any questions - about dairy or ASD, which I'm also very familiar with. xo