Tomatoes require plenty of water when fruiting. The hose is useless on a hot summer’s day. Take a two litre plastic bottle, drink the contents, put a pin hole in the side down at the bottom of the bottle, then fill with water and place it in the garden by the tomato plant. Remove the pin and a fine stream of water will run out, taking about 4 hours to empty. The water will not affect the tomato on such a fine day, and it will get the full benefit, resulting in more fruit. Do this daily in fine weather.