First and foremost, you need to restrict your salt/sodium intake, and increase your potassium intake.
The majority of canned foods are very high
, as are, cheeses, pickles, and butter. A low fat diet is also beneficial.
Excessive amounts of alcohol and caffeine should be eliminated and definitely no smoking.
It all comes down to a well balanced diet along with exercise and being faithful about taking your precribed medication, if need be.