The best replacement for saline is silicone.

The best alternatives to saline are rated as following:
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Your alternative for saline is not listed? Suggest!
Speaking about saline, one probably shouldn't forget about potassium chloride.

Other search terms related to saline and their ratings are:

★★★★★ potassium chloride
★★★★★ blood transfusion
★★★★ dextrose
★★★ kcl
★★★ nebulizer
★★ suctioning
★★ albuterol
You have in mind a companion for saline and it is not yet here? Propose!

Google Trends

Scale is based on the average worldwide traffic of saline in all years. Click on graph for more.
silicone implants