Like diapers, you really have to try some. Everybody's taste buds are different and what tastes ok to some is bad to others.
I occasionally use Similac. I like it cold. Many people do like the formulas that are geared to older babies.
There can be problems with some of the minerals and vitamins in formula and the requirements of adults. If you do not have any physical problems and drink only occasionally, you will not have any problems.
Many people just use regular milk and mix it with honey or some other liquid. Some use juice.
It really is whatever you want - no right or wrong.