Is there a water kettle or dispenser that can keep the water lukewarm? I'm looking for a kettle or a dispenser that can keep or warm up the water around 100 F. The hope is to drink the warm water directly. All the devices I've found so far are made for boiling the water for making Tea, etc. I could get a dispenser, mix hot and cold water. However, I'd need to be careful every single time to mix them in the right proportion; just hoping to avoid any risk.

Update

I was hoping to find a make-human-lazy sort of tool for this but didn't succeed. Thanks for all the answers. I'm going to use the good old stove for warming up and a vacuum flask to store them. I might consider something like this in the future - https://www.amazon.com/dp/B01N4WYPDX?ref_=pe_623860_70668690 .
The easiest tool I can think of is a thermos - fill it with water at or slightly above your desired temperature and enjoy your supply for a few hours.

On a larger scale, a tankless heater can give you a basically unlimited supply of water, but is almost certainly overkill.

Please be careful with all devices that keep water at around 100F / 37C, this lukewarm water will encourage the growth of microorganisms, aka a biofilm. This is also an issue with all water dispensers / coolers, which should also be cleaned regularly.