Blender bottle is like the pioneer for those types of bottles, so that’s why it’s the “best”. It was just the first of its kind, or the first one to popularize the bottle. But you can use any brand that comes with the metal shaker ball and it’ll be similar.

You can buy from amazon, or just go visit any local fitness/supplement store and they’ll have

300 grams of chicken breast will give you almost 70 g of protein (if that chicken breast is raw - it wi be different for cooked). Tracking protein will be easier if you use a program/app, like myfitness pal.

Would also be helpful to know your current weight and/or goal weight, as your protein intake will vary somewhat because of that. And also calories, which could arguably be more important than protein. You could be eating 250 g of protein but if you’re not eating at a caloric surplus you won’t gain weight.

You also need veggies and fruit, you’re seriously lacking in vitamins and micronutrients here

Needs more veg

If you want to gain weight, you need to be in a caloric surplus. That shake will definitely help, as it’s calorie dense, but it really depends what your overall diet is like too.

If that’s all you eat during the day, then no you won’t gain weight. If you eat that shake to supplement your other 2-3 meals of the day, then you’ll probably gain weight. But we can’t give a definitive answer without knowing your age/weight/height/diet (diet as in what you eat habitually, not a restrictive meal plan).

Also, just like you can’t spot reduce weight, you can’t spot add weight. So if you’re going to gain weight, most likely your hands are going to be the last place you would gain weight, at least a significant amount that it would make your hands bigger.

Why does having skinny hands bother you this much?