93% battery health after 5 months of use

Is it normal that my battery health drops from 94% to 93% in just a day?

Sure, when you realize that Apple does not display any tenths in the percentages and they always round down to the closest number.

For example, your battery might have been at 94.0% yesterday and today it might be 93.9%. That 93.9% will be displayed as 93%, so it looks like the battery dropped 1% when it only really dropped .1%

You can expect your battery to go about 2 years before it needs replacement, so you probably have about another year and a half to go on your battery.

You don't need to be watching the battery all the time. It will just make you worry when you don't need to.

Your iPhone battery health decline is not linear and is subjective to many factors, such as usage and conditions. You can expect an average of a 1% decline per month, and some months it will be more or less. Your iPhone should take about 2 years to hit 80% battery health, so don’t keep worrying about it, and just enjoy and make the most out of your iPhone.