I used to manage my Zig installation by installing the binary and copying to my path. Not too hard, but now there is even an easier way by using zigup.
To install zig, it enables you to simply type zigup master
I would recommend to get the latest binary from the Github releases page. Or if you already have Zig, install it from source:
# Install the binary
git clone [email protected]:marler8997/zigup.git
cd zigup
zig build -Dfetch
cp zig-out/bin/zigup ~/.local/bin/