What is the purpose of Solenoid Valve in Reverse Osmosis? Can I do away with it?
Despite the fact that Amazon is no doubt delighted that you think they are the only place to order stuff online, they are not. 

I would suggest expanding your online vendor search considerably. 

And no, unless you somehow know when the valve should be actuated and do so at those times, and only those times, "simply bypassing it" can be clearly described as "simply breaking your RO filter differently than it's broken now."