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As long as they are in the ground, most likely they are fine. Plants need far less water in the winter than in the summer and the ground normally holds more than enough to keep them alive.

The issue I see could be that without snow, the plants may not have had the insulation they are accustomed to, and that can hurt the plants. If you fear the plants may be dead, this article will help you tell that:
https://www.gardeningknowhow.com/plant-problems/environmental/how-to-tell-if-a-plant-is-dead-and-how-to-recover-an-almost-dead-plant.htm

What are the varieties? Blueberries grow best when they cross pollinate. If you have all the same variety, they will not produce well.

Since there are many reasons for this and I cannot see for myself, here is a site that you may find helpful: http://www.fruit.cornell.edu/berrytool/blueberry/leaves/BBphos.htm

They do not typically flower before putting out leaves. Beyond this, new bushes only a year old would likely not bloom the first year.

This article will help you:
https://www.gardeningknowhow.com/edible/fruits/fegen/protect-fruit-tree-birds.htm

This sounds like a fungus, though it is hard to say which one as there are several that can cause this. I would treat the plant with a general fungicide and this should help to clear up the problem.