Campsites at Warroora

Hi,
we are planning to travel to Warroora Station with the camper trailer next year. Does anyone know how easy it is to get a campsite there during the school holidays. We are thinking of travelling in the April Hols.
Are there plenty of campsites available of is it like some of the other camps where you have to be really really early and cross your fingers to be able to get one.
Thats probably my only concern is travelling that far with the kids only to find no where to stay.

Also where would be the nearest place to be able to top up water containers with fresh drinking water. we will have plenty with us but just incase we need to top up.

Can anyone who has been up that way in late April/early May let me know what the weather and wind is like at that time of the year.

Thanks in Advance

Cheers Tony