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In that kind of heat, you are likely underwatering. They will need to be watered twice a day at least. They will use water quickly. Placing them in a shaded location will help reduce the heat stress on them.

Here is an article that you may find helpful: https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/hibiscus-propagation.htm

The blue beads are fertilizer capsules in the potting soil. They dissolve over time and are what makes the soil "time released" with fertilizer.

Potting soil can sometimes dry out to the point where it actually repels water. I would try flooding the container to make sure that the soil is properly hydrated and ready to take water in.

Hardy hibiscus can usually survive winter outdoors but in cooler regions (up to zone 5) will need additional protection, such as mulch and wrapping. As long as you can give it added protection during extreme freezing conditions (and as long as you don't have the tropical type-which need to be inside over winter), it should be ok. The tropical varieties are the ones that require growth indoors over winter.

They are in the seedpods that form from the dead flowers. This article will help with growing them from seed (at bottom): https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/hibiscus-propagation.htm