You'd need resistance wire - either nichrome or kanthal. I don't have the
tank in question, but as a guestimate 34 AWG (0.16mm) or 35 AWG (0.143mm) Nichrome 80 wire should allow you to get close to the target resistance with a reasonable sized coil. Kanthal is slighly higher resistance for the same diameter compared to nichrome, so I'd err more towards the larger diameter with kanthal.
To tune the resistance you can add or reduce the number of turns of wire in the coil. To increase the resistance you add more turns of wire, to lower it use less. If you were aiming for a lower target resistance (say 1.5 ohms) then it would be sensible to use a thicker wire than I suggested above rather than have just a couple of turns of a thinner wire. This is because a very small coil using a couple of turns would concentrate the heat in a very small area and would tend to burn
juice and burn itself out easily.