Related Clues:

• Water - thoroughly
• Healthy - source of water
• Spring - in good condition
• Healthy - water supply
• Spring - in good health
• Source of oil - healthy - goodness!
• Expression of doubt
• Healthy — water supply
• Borehole
• Not sick
• Hardly rare, in restaurants
• 'Now that you mention it ...'
• 'Now that you mention it...'
• 'Uhh ...'
• 'Let me think...'