From a dietitian's perspective, here are a few tips to keep your stomach from stretching:
1- Do not eat and drink at the same time. It's best to wait 30 minutes before and after your meal before you resume your drinking
2- Avoid carbonated beverages since the gas will cause major stomach discomfort and possible stretching.
3- Try not to push yourself to eat beyond your 'new' satiety feeling
For more information do not hesitate to ask me anything regarding bariatric surgery and nutrition