The best replacement for ringers is normal saline.

The best alternatives to ringers are rated as following:
★★★★★  normal saline
★★★★  lactated ringers
★★★★  saline
★★★★  sodium chloride
★★★★  ns
★★  megatones
★★  d5w
★★  plasma lyte
★  normosol
★  ringers
★  call tones
★  mega tones
★  megatone ringers
  master tones

Your alternative for ringers is not listed? Suggest!
Speaking about ringers, one probably shouldn't forget about dextrose.

Other search terms related to ringers and their ratings are:
★★★★★ dextrose
★★★ d5w
★★ 5% dextrose
You have in mind a companion for ringers and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of ringers in all years. Click on graph for more.
ringers
normal saline
lactated ringers