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

Two suggestions:

Bird's Dessert Mix (from England) is available in a multi-portion can,
and in a box with little sealed envelopes.

Manischewitz Instant Pudding and Pie filling (chocolate) lists the
following ingredients:
Sugar, modified tapioca starch, dutched cocoa, tetrasodium pyrophosphate,
disodium phospate, salt, artificial flavor.

My little celiacs have eaten both without undue effects.

||  John E. Cornell - Rockville, Maryland  ||
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||  Oh Lord, help me today to be more like Jesus, and less like me.  ||