March 18 (Reuters) - Drinks maker Fever-Tree on Thursday forecast better 2021 revenues with at-home drinking catching on and sales at lockdown-hit bars and restaurants expected to gradually gain momentum. The maker of drink mixers confirmed preliminary 2020 numbers that showed a 3% drop in revenues and said it expected the group to deliver revenue growth of between 12% to 16% this year. (Reporting by Vishwadha Chander and Pushkala Aripaka in Bengaluru Editing by Tomasz Janowski)