Hand soap starter set

I really like this hand soap, my only concern is that it is a bit of a faff to make it, empty the sachet of powder into the bottle (have to be very careful not to spill any over the edge), then fill it with water, shake it. I'd much rather it came pre-mixed, maybe in the bottle itself or in a separate sachet (with a spout that nicely fits into the bottle neck). Otherwise, it is a really good soap, good degreaser, good cleaner, and smells great.