In our SVA tradition we recommend the following:
Fruits:
In the early morning consume only stewed fruit because fruit is rich in soma (lunar energy) which is a cooling energy, and the morning time has more influence of lunar energy because the sun is still just starting on its journey. In SVA we also recommend raw fruits that are high in enzymes and that help support digestion and metabolism be consumed either after lunch or along with lunch – as long as you are not taking any yogurt or lassi with lunch. Some enzymatic fruits are: pineapple and papaya. Otherwise, fruits like apples, pears, apples, blueberries, and blackberries should be consumed 1 and a half hour after lunch. 3pm is a good time in general, if you’ve had your lunch around 12 or 12:30pm
Milk:
Boiled milk should be consumed with oatmeal or quinoa flakes for your breakfast. You can also have some milk before going to bed at night – have milk only at least a couple of hours after dinner, nor right after dinner, in case you have late dinner. Milk should always be boiled with a little bit of cardamom and cinnamon. Cinnamon helps sugar metabolism of the milk and cardamom helps digest the protein in the milk. If your physiology can handle it, you can add a small piece of fresh ginger – grated or whole.
Water:
Consumption of water during lunch depends on what you are eating. If you are eating bread or any other dry foods, then you need have to support your stomach by sipping some water during your meal. If you are having liquid food, like soups or lentils, it’s best to avoid drinking water during your meal. If you are consuming a lot of spices like green chilies, black pepper, or ginger, it’s best to always drink some water during your meal. In general, it is recommended that one have water one hour after the end of a meal because it can aid in the process of digestion – the digestive fire may need extra water for lubrication. Keep in mind that water consumption is based on each individual’s body type. Pitta body individuals, because they receive more agni or digestive fire, need more water. It is also based on the weather, if it is too hot, people tend to sweat more and therefore need more water. So, the golden rule is there is no specific one rule for everybody to follow…
As for your final question, yes, it is ok to cook in pressure cookers.