Italian zucchini and potato stew

Ingredients

• 1 Onion
  
• 1 Clove garlic
  
• 2 Medium russett potatoes, peels and cut into two in chunks
  
• 2 Medium zucchini, or one zucchini and one yellow squash, cut same size as potatoes
  
• 1 14 oz. can diced or chopped tomatoes
  
• 2 tablespoons Capers (more or less to taste)
  
• 2 tablespoons Water
  
• ¹/₄ cup Pitted olives (more or less to taste)
  
• 1 bunch Basel, julienned
  
• Salt and pepper to taste