Interviewer instructions
Record the code for the most usual source. If several sources are mentioned, probe to determine the most usual source. If the source varies by season, record the source for the season of the interview. Note that the next question is only asked if the response to this question is 'Bottled water'. You should skip WS2 if the response to WS1 is other than 'Bottled water'. If the response is 'Piped into dwelling' or 'Piped into yard/plot', record '11' or '12', respectively, and skip to WS5. Otherwise, skip to WS3.