Lowering pH and adding Ca

[jeff47]

We set up a container garden to try and grow tomatoes as a first-time "let's see if we can grow anything" exercise.

The plant exploded, the greenery was doing very well, we actually destroyed two tomato cages because the plant got too heavy for them.

...And we ended up losing all the fruit to blossom-end rot. Actually testing the soil (what a novel idea!) showed that the pH is high for tomatoes (7.4).

Do you guys have recommendations for lowering the pH and adding calcium to the soil? And how do I figure out how much to put into the container?