OK, here are some shake recipes from an old post. Maybe he can mix himself up some of these.

All sent. In case anyone else wants them:

One (750 calories):
1 cup milk or soy milk
1/2 cup ice cream or sherbert
1 scoop protein powder (Spiru-tein or other, but note Ed's comment on Spirtu-tein))
1 Benecalorie (this is 330 calories alone, but note Karen's comments on weight)
2 TBSP Canola Oil (240 calories alone)

Two (500 cal):
Ensure Plus
1/2 cup ice cream

Three (obtained from some site somewhere, 1300 calories):
2 cups ice cream
1 cup whole milk
1/2 cup 1/2 and 1/2
1 pkg instant breakfast
1 tablespoons malted Milk
2 tablespoons Ovaltine

I've already experimented with the first one. IE, mixing Ensure, Support, Boost, skim milk, etc. She just gave me that as a base, so it's obviously flexible.