What sort of water pump do I need for a smallish house with Kitchen, 1 toilet and 1 shower?

The house is on 2.4m stilts.

I am assuming I only need a small household pump that would cost around 9,000 baht (I have no idea).

Do I just sit it on the concrete floor downstairs or do I bolt it to the floor? Onga? Davey? Any other brand?

Cheers