My first mistake was trying to use a push to connect end cap. Those were meant for open copper pipes.

not a threaded opening like that one.

Get a brass cap in the size required (3/8?) Teflontape a screw it on.

If the hot water is turned off through that cutoff valve then just cover the outlet port with some type of tape or cloth to keep dust out until you get another dishwasher. Many homes have plumbing roughed in with exactly that going on for decades.

Dope, thanks!

Yeah that was my fallback (to basically cork it similar to the disposal), but it's piped strangely.

Like one of the valves turns on the water, and the one on the off side (with the opening) controls the pressure. So I can have hot water but I get a trickle when it's turned off. So basically just need to close the opening and bada bing bada boom, hot water pressure.

Go to home improvement store or hardware store and ask for a cap for a under sink line and show them this picture. The user access only has 2-3 sizes and this is by far the most common for water.

Get good Teflon or equivalent, wrap opposite direction as the threading so counter clockwise (so you don't unravel as you turn) 2 wraps is sufficient. Cut 90° and lay flat as wrinkles will lead to leaks. More isn't better

Obviously turn valve off as well and if you see any calcium hit it with clr type cleaner now while you have access

Cap hand tight and check for leaks. Now you have access to a water line when you need it down the road

Take these pics to your local home repair outlet store and ask for help. The dishwasher should have its own cutoff valve and that should completely turn off the water. Yours looks old. You may have to put another in upstream of the one you have and cut out the old one. There looks like enough room for that but just barely. We just replaced our dishwasher a week ago. The cutoff valve did work as advertised and there was no problem. The type you have is notoriously unreliable as it gets older. This isn't a difficult repair even if you have to replace the cutoff valve. There are lots of youtube videos that will explain this well.

There are different types- this is very likely 3/8" compression.

So something like this will work:

https://www.homedepot.com/p/Everbilt-3-8-in-OD-Compression-Brass-Cap-Fitting-801039/207176342

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Clockwise if you are looking into the open thread and it's a right hand thread.