Ketogenic diet gives the best results when followed strictly without skipping meals and following the rule of high fats and low carbs. The basic rule of Keto is to eat high fats; adequate protein and low carb until you finally reach the point of satiety. If you want to know how much I can eat on keto navigate to https://aussieketoqueen.com/how-much-should-i-eat-on-keto/.
To stay hydrated, try to drink as much water as you can. The body tends to lose a lot of water molecules when it goes on ketosis and consuming more and more water would be beneficial.
You should also keep in control the salt level of the body which helps the body to stay at optimum temperatures and function properly without problems like headache, anxiety, frequent hunger attacks etc.
Make sure you take a little more salt than the usual quantity in the first few days to help your body adjust with the new changes caused by Keto flu and develop ketone acids.
Vegan people or people allergic to a vegetarian diet, having high cholesterol levels can consider eating some cream cheese rolls with mayonnaise dipping or avocado salad in keto diet.
They can also have fried beans with tacos and vegetable salad which would be easy for digestion and a ketone body's formation.