To make an easy goo all you need is glue and a stain remover such as Shout. Just mix the 2 together. If the goo is sticky or sticking to your hands then add more stain remover.
There are at least four alternative types of leavening: egg whites (e.g. angel cake), yeast (e.g. a yeast coffee cake), baking soda combined with some kind of acid (e.g. cream of tartar or vinegar),...
The proper substitution for baking powder is half baking soda and half cream of tartar. They both have leavening properties. If you don't have cream of tartar available, I guess I would go toward 2/3...
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