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What this research suggests is that 21 days to form a habit is probably right, as long as all you want to do is drink a glass of water after breakfast. Anything harder is likely to take longer to become a really strong habit, and, in the case of some activities, much longer.
Give yourself time. Forming a new habit can take a long time. Some people can form a new habit in as little as a few weeks, while other people will take several months. As you work to form your new habit, just keep in mind that it may be a while before it is automatic. Try to be patient with yourself as you form your new habit.