Travelers should take several key precautions regarding water safety and hygiene in regions where waterborne diseases and poor sanitation are common, focusing on avoiding contaminated water and food, practicing good hand hygiene, and being prepared to treat illness promptly if it occurs. The most fundamental rule is to drink only bottled water with intact seals, boiled water, or water that has been filtered or chemically treated with iodine or chlorine tablets, and to avoid ice cubes, fountain drinks, and beverages made with tap water unless the water source is confirmed safe. When eating, travelers should choose restaurants and food stalls with high turnover and visible food preparation, avoid raw or undercooked items, salads washed in untreated water, and unpeeled fruits they did not peel themselves, because these can carry waterborne pathogens from irrigation or washing. Frequent hand-washing with soap and clean water or using alcohol-based hand sanitizer before eating, after using the toilet, and after touching potentially contaminated surfaces is one of the simplest and most effective defenses against gastrointestinal illness. Travelers should carry personal hygiene supplies including hand sanitizer, wet wipes, toilet paper, and their own reusable water bottle with a built-in filter for situations where bottled water is unavailable or expensive, and they should avoid swallowing water while showering, swimming in pools that may not be properly chlorinated, or swimming in rivers, lakes, and ponds in regions with waterborne parasites like schistosomiasis. In countries where water infrastructure is limited, it is also wise to avoid contact with floodwaters or standing water, which can be heavily contaminated with sewage and industrial runoff, and to wear waterproof footwear in areas where sanitation is poor. Travelers should pack a basic health kit with oral rehydration salts, antidiarrheal medication, antibiotics for bacterial infections (if prescribed by a doctor in advance), and water purification tablets for emergencies when safe water is not accessible. Monitoring the color, smell, and clarity of tap water and asking locals or hotel staff whether it is safe before using it for drinking or brushing teeth helps avoid unpleasant surprises, and in case of symptoms like diarrhea, vomiting, fever, or severe cramps, seeking medical attention promptly and rehydrating aggressively with oral rehydration solutions or clean fluids can prevent dehydration and complications.