Very few people actually follow a 100% carnivore diet, at least for the majority of their time on it. My diet consists of 90-95% meat, eggs, butter, salt and water; the remainder is pretty much dairy and occasional fruits.

Apart from electrolytes, it's recommended to initially transition slowly into a carnivore diet throughout 6-8 weeks to avoid a lot of the issues that one can suffer. Also, make sure you're getting enough fat, avoiding eating lean meat and if you do, add plenty of extra fat. Ear until the meat stops tasting good, a lot of people undereat. Cheers!