Borewell drilling stopped at 780 feet in a house in Namakkal District, Tamil Nadu - Please suggest a suitable pump based on capacity, power source and the kind of pipe to be used

Hello Sir

I am from Namakkal Dt, TamilNadu. I did borewell for 2 house use purpose. 

Used 61/2'' borewell.

Till 100 ft it was fully dry powder

Around 100 ft the dry become wet.Then we got 3/4'' water at 680' feet. At this level only water came out in a drizzling way.

The borewell operator said it could be between 1' to 11/2' water. Then we stopped at 780 feet.

My questions are,

1. What kind of pump I should use like 1 BHP or 2 BHP?

2. what kind of power source i have select like Single phase or Three phase?

3. What kind of pipe I should use. Single full lengh pipe or Joined PVC pipes ?

Thanks in advance.

Muthusami.