You have plenty of latitude on width. the critical dimension is the diameter which has to match the rim, but since the tire is open at the bottom any width within reason will fit.
I'm currently running a 26x1.4 tire on the front and a 26x2.0 on the rear. There's no real reason except that I cut the rear tire and the 2.0 was handy at the time, and I'm old school cheap - once a tire's on, it stay's on until cut or worn out.
Use the tire width chart shouldberiding linked to and pick a decent tire within the correct width range.
__________________
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.