OK, 3 tablespoons of yogurt comes out at 78mg calcium, so it is a good dense source.
Here's some numbers to "chew" on
Calcium per cup (16 tb in a cup):
lowfat yogurt 415mg (26mg per tb)
cottage cheese 155mg (10mg per tb)
Calcium per ounce (1 oz is 1/4 cup shredded or a 1" cube solid):
cheddar cheese 204 mg
I wonder if instead of a tums, if you could get one of those solid, swallowable calcium tablets (like oscal) and dissolve it into the broth you cook the rice in...