Soapmaker here - I'm afraid it's not necessarily safe. It's to do with the potential for bacteria growth.
Solid soap relies on the high pH and low water content - contrary to what a previous poster has said, it doens't give a suitable environment for bacteria/viruses to flourish in. Bar soap performs well in tests and hygiene-wise it's only a problem if the soap is not left to dry between use, but left to sit in a puddle of water.
Liquid soap may or may not have a preservative added - this depends upon the precise pH and the dilution. If it's a commercially-produced liquid soap, it probably does have a preservative to be on the safe side. But by diluting it you are altering the recipe that the manufacturer/cosmetic safety assessor has deemed safe. You don't know what the new pH is, or the new concentration. Do you sterilise the water first, or do you just use tap water? You don't know what bacteria you're introducing into the mixture with the water, and you don't know whether your new pH will be low enough and your water percentage high enough to render the preservative ineffective. This could allow all sorts of things to flourish. It might be safe but it might not. It hasn't undergone any of the appropriate assessments.
Please don't dilute your soap unless you are sure you know what you are doing. And please could non-chemists stop saying, 'yes it's safe, it's soap, it gets water added when it's used' - the water added in normal use is quite different, as it's being added briefly and then the entire mixture washed down the plug hole - the mixture in the bottle isn't compromised and any bacteria in the water on your hands are not being given the chance to grow and flourish.
OP, your bar soap is perfectly safe if not left in a puddle of water. It won't 'hold on to most germs' and particularly not Covid-19 as contact with the soap is likely to kill it. If it does end up in a puddle of water accidentally, rinse it off and dry it.