Use thes zig_inst gist to manage multiple versions of zig in your ~/.local/share/zig/ directory

# Usage: use zig <version>
#
# Loads the specified zig version into the environent
#
use_zig() {
  zig_inst -q $1
  ZIG_DIR="${HOME}/.local/share/zig/$1"
  ZIG_UPDATE="${ZIG_DIR}/zig_update"
  if [ ! -f "${ZIG_UPDATE}" ]; then
    echo -e "#!/bin/bash\nzig_inst -q -f $1\n" > "${ZIG_UPDATE}"
    chmod a+x "${ZIG_UPDATE}"
  fi
  PATH_add "${ZIG_DIR}"
  PATH_add "./zig-cache/bin"
  PATH_add "./zig-out/bin"
  echo "Using zig $1"
}

This not only adds the correct version of zig to your PATH, but also adds the local output dir (./zig-out/bin). (./zig-cache/bin is also added to support older versions of zig)

zig_update is also added as a command to update the zig master build to the latest (running it on other versions will work, but likely has no effect). Those 4 lines can be omitted if desired.

Very simple:

use zig 0.8.0

...and you're ready to go!