Good diet and supplements have never been disputed, what is disputed is that good diet or bad diet can effect the blood or lymph systems ph levels. It doesn't, this is a scientific fact. If it did, then all the many millions of people who eat poorly and make bad lifestyle choices, would be dead, they are not. This is why true acidosis and alkalosis is very rare.
If you are indeed eating a good diet, and have a healthy lifestyle, there is no need to 'alkalise', your body will be well balanced.