Was there any evidence that the batteries tipped over during shipment? It seems unlikely that they just partially filled every cell. I'd say refuse shipment if that's an option. If it's not, I'd ask your supplier to provide acid to refill them. And if they won't supply it, you can get it yourself. The specific gravity for new batteries is 1.265, that's probably the only strength you can buy. It isn't mixed with water, just add it straight.

By the way. Don't ever mix water and battery acid but if you do, pour the acid into the water. Not the other way around.