First off is that one kilogram of refined fuel which would require how much unrefined fuel (water) to make?
Fuels
Deuterium is abundant as it can be extracted from all forms of water. If all the world's electricity were to be provided by fusion power stations, Deuterium supplies would last for millions of years.

Tritium does not occur naturally and will be manufactured from Lithium within the machine.

Lithium, the lightest metal, is plentiful in the earth's crust. If all the world's electricity were to be provided by fusion, known reserves would last for at least 1000 years.

Once the reaction is established, even though it occurs between Deuterium and Tritium, the consumables are Deuterium and Lithium.

Quantities
For example, 10 grams of Deuterium which can be extracted from 500 litres of water and 15g of Tritium produced from 30g of Lithium would produce enough fuel for the lifetime electricity needs of an average person in an industrialised country.
Source