You cannot just add water to ground coffee like you would with instant coffee.
Ground coffee will not turn out the same when just added to water without it being filtered and the water going over the coffee grounds.
You would just end up with grounds in your coffee cup as the coffee grounds would simply sink to the bottom of the cup without extracting the coffee from the coffee grounds.
You can however use a coffee filter and then place it over a cup and put coffee grounds into the coffee filter and pour hot water over the coffee grounds to make coffee without a coffee maker.
Using ground coffee as instant coffee may result in a slightly different flavor profile than traditional instant coffee.
The texture may also be coarser due to the presence of coffee grounds, and there may be some sediment in your cup.
Instant coffee differs from ground coffee because instant is made from dried coffee extract but is more concentrated.
Through a quick drying process or freeze-drying process, a powdered coffee extract is then created.
When you add that to the hot water, it dissolves to create a cup of coffee in a flash.
Instant coffee is made from real coffee beans.
The soluble and volatile contents of the beans are extracted.
Then the water is removed so powder or concentrated soluble coffee powder are left over.
It's essentially been dehydrated for our convenience – just add water.