I am going to recommend you just take a recipe from the site, mix it up, and try it out. Your biggest obstacle will be finding a recipe you don’t mind drinking regularly.
Almost any DIY will work for weight loss for a couple of reasons. One they generally don’t use a lot (or any) sugar so the carbs are slower acting and don’t spike your blood sugar as much. Two, none of them are going to taste so good that you constantly pleasure eat throughout the day.
Tell yourself you will only drink your mix for two or three weeks, don’t have other snacks in the house. Drink small glasses with lots of water whenever you feel hungry throughout the day. It is easy to count calories because you know how much is in each ‘days’ worth you make up, but you really don’t have to count. Most likely is after a couple of days you will stop drinking when you aren’t hungry.
If you like fruit you are welcome to try my recipe Crude Food 1.1 with frozen fruit , it is low carb and I think tastes good. Or sort by popularity and ‘People Chow’ will be at the top. It is a simpler recipe to start with and you can add ingredients as you get comfortable. I’m sure there are also recipes by your fellow countrymen which might help with sourcing supplies.
The main thing is just make up any of the recipes that are reasonably complete and give them a try. If you feel you must have a number then 2000 calories is as good a number to start from as any, if you don’t lose any weight in two weeks then drop to 1800 and repeat.