Our RV did not come with sprayers.
I just added them to both toilets.
Not real pleased with the way the macerator toilets leave the bowl after certain evolutions
I tapped off the hot water lines. PEX 1/2 x 1/2 x 3/8 tees using sink sprayers.
And I found out after the fact, some sprayers allow the the spray head to rotate on the hose, and others you have to orientate the head in the direction you want when making the connector tight (o-ring versus gasket seal).
While I was at it - our water heater is under the 1/2 bath sink. Took too long to get hot water from such a close location. So when I teed the sprayer in, I teed the sink right off the water heater. Almost instant hot water now.
And since it is kind of related and has come up before. The tank washout lines. Since we have the forward bath my lines must be 30' long between the docking station and tank ports, because of the vacuum breakers.