Drinking more water [no more than 2 litres of water per day] especially before meals can help with weight loss.
Daniels MC, Popkin BM. Impact of water intake on energy intake and weight status: a systematic review. Nutrition reviews 2010; 68(9): 505-21 https://www.ncbi.nlm.nih.gov/pubmed/20796216
Dennis EA, Dengo AL, Comber DL, Flack KD, Savla J, Davy KP, Davy BM. Water Consumption Increases Weight Loss During a Hypocaloric Diet Intervention in Middle-aged and Older Adults. Obesity 2010; 18: 300-307. doi: 10.1038/oby.2009.235 https://www.ncbi.nlm.nih.gov/pubmed/19661958