<<Disclaimer: Verify this information before applying it to your situation.>>

There is still so much more great advice to share- Hope you find it as
informative as I do!

-Vance's Dairy Free Milk
-Nucco Margarine
-Toffuti Sour Cream and Cream cheese
-Toffuti Ice cream -which is dairy free
-Cheese is another story......it is hard to find a good cheese
-Willow Run soy margarine is casein free and is good to bake with
-For Butter we use "I Can't Beleive that it's not butter", it does
contain buttermilk...I don't know if that has any
 quantity of casein in it or not.
-For Milk we use Trader Joe's 'Soyum Original' soy milk. chilled it is
about the best we have found
 haven't found a good casein free cheese yet
-The Fleishman's Light margarine is corn based and gfcf- taste and
texture are very good
-Tofutti makes a fabulous cream cheese and sour cream.  There is no such
 thing as casein-free fake cheese, except for one brand.  They are all
 hideous :P  Silk makes the best tasting yogurt and soymilk, and they are

 all gf except the plain yogurt.

Here's a response that had lots of info- I'll copy it here:
The one you definitely won't replace is cheese.  There is a product by
Soymage called "Vegan Singles" that gives the illusion of cheese.  I've
used the mozzarella style singles when making dairy-free lasagna.  It
kind of melts like cheese and gives the texture of cheese, but it doesn't
really taste like cheese.  I believe most of the other cheese substitutes
still contain casein or some other component of dairy.  Look for the word
"Vegan" as a starting point... vegans do not eat any dairy.

For a cottage cheese type replacement (for lasagna, not for eating
straight) I crumble firm tofu into a bowl and add a vegan sourcream
substitute to give it a little tang.  You could also add a vegan yogurt
(not real yogurt) for that bit of sourness.  When you add italian spices
to this it creates a lasagna that looks and tastes just like the real
thing (the key is lots of sauce to help mute the tastes from the
substitutes, which aren't strong but also aren't cheese).

I have recently discovered coconut milk as a milk substitute for recipes
that call for cream, like gravy or pasta sauces.  It is a different
flavor than dairy, but if your son is into spices at all it goes really
well with asian and indian spices.  Look for recipes from Malaysia,
Indonesia and Singapore for the greatest variety of dishes that use
coconut milk, then experiment on your own.  Theother night I made
"stroganoff" using coconut milk and some indian spices (they aren't
hot... the ones I used are sweet-aromatic.  Nutmeg and cinnamon, believe
it or not, are key spices in indian food)

I use soy milk for alot of things.  I don't use any particular brand.  I
think there is some question about some not being GF (something about
barley as a hidden ingredient) so search the archives if nobody mentions
this to you.  I use soymilk as a direct substitute for milk in baking and
any recipe where milk isn't the key ingredient.  I've found that it works
fine in cooked puddings, but not in instant puddings (I'm not GF yet so I
don't know which puddings, if any, are safe).  When I need a richer
liquid I use a powdered soy drink mix ('better than milk' brand is all
that I've found here) or silken tofu.

We use Blue Bonnet, although it does have a milk ingredient in it and I
can't recall off the top of my head which one.  My friend doesn't react
to it, but read the label as it might be off limits for your son.

One of the keys to dairy-free cooking (and any cooking, really) is to use
spices and seasonings to distract you from the missing ingredients.  Last
year we discovered Penzey's Spices (www.penzeys.com) and have been
wondering why it has taken us so long to kick our bland dietary habits.
I haven't checked on their GF status but I'm sure they will answer your
questions.  They hand mix their own blends from pure spices, and the
difference is dramatic.  Their cinnamon tastes like a cinnamon red-hot
candy.  The only products that are probably of concern would be their
soup bases and their salad dressing mixes.

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