This article will help: https://www.gardeningknowhow.com/edible/vegetables/squash/pollinate-squash-by-hand.htm
The squash are not growing. The plants bloom and have small squash, but they just wilt away. What could be the problem?
It sounds like it might be a pollination issue. These articles will help:
https://www.gardeningknowhow.com/edible/vegetables/squash/squash-fruit-falling-off-the-plant.htm
https://www.gardeningknowhow.com/garden-how-to/beneficial/insect-pollination-process.htm
https://www.gardeningknowhow.com/edible/vegetables/squash/pollinate-squash-by-hand.htm
Every year I rotate crops per suggestions. My squash ALWAYS gets squash bugs and ALWAYS gets this powdery stuff on its leaves. My cukes do the same per say. What preventive measures should I be taking?
Try neem oil. It is both a fungicide and a pesticide, so will take care of the squash bugs and the powdery mildew. Here is more information:
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
My squash leaves are huge. Should I cut some of the leaves?
This article will help you:
https://www.gardeningknowhow.com/edible/vegetables/squash/should-you-remove-squash-leaves.htm
Can I grow more than one squash plant in a container? The container holds one bag of organic soil.
Where can I buy a calcium-rich foliage spray in Texas? Went to Home Depot and some nurseries and couldn't find one. I did find bone meal.
Try searching on Google for local retailers. This article has more info on calicium for plants: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-and-calcium.htm
What causes the squash to shrivel and drop off when small? Is it as simple as not enough water or is something else causing this?
These articles should help:
https://www.gardeningknowhow.com/edible/vegetables/squash/squash-fruit-falling-off-the-plant.htm
https://www.gardeningknowhow.com/edible/vegetables/squash/squash-blossom-end-rot-causes-and-treatment.htm
https://www.gardeningknowhow.com/edible/vegetables/squash/squash-pests-identifying-and-preventing-squash-vine-borer.htm