The most practical solution might be to dig a hole in the yard (or other low point) and put a 5 gal. bucket in and fill with water. In a low place, the bucket should fill quicker from the low pressure supply. Then fill the washing machine from the the bucket. The old mechanical timer machines work well in underdeveloped areas. When I was small, I helped my aunt wash clothes in her wringer washer on the back porch.