Related Clues

• No-cal drink
• Firefighting need
• Contents of a dog's bowl
• Puzzle's theme (shown in 20-, 40-, 58-Across and 21-Down)
• End of the quip
• It's in the spring
• Addition to a concentrate
• An element, to the ancients
• Use a hose on, as a garden
• Pipe contents
• It may be well-taken
• Marathon handout
• See 22-Down
• Desert wanderer's request
• 10K race handout
• Tend to, as flowers
• Tend the plants
• No-calorie beverage
• Radiator filler
• Word that can precede the first word of 20-, 32-, 43-, and 56-Across