Shop small/temporary fuel handling ideas/containers? (carb fill, test run...)

I think I got most of the gist into the title...

Just trying to think what's reasonable/safe/ideal for a couple of use cases, and perhasps some I haven't thought of. The main two are:

1. I just want to be able to put a few ounces of fuel in a float bowl without putting it also on the intake manifold, distributor, and my left sock. (So probably something not far from a ketchup bottle, but perhaps more specific)
2. I want to start and briefly run a carbureted engine without getting involved in the Superfund project that is cleaning out the tank and lines. (So a small tank to hang from the hood with a nipple to connect to carb inlet?)

Or maybe I'm approaching it wrong. What do folks do for these sorts of situations?

I just retired a couple of bicycle water bottles that started imparting their own hyperlocal terroir to my ride drinks and was about to start looking up what kind of plastic they're made out of and figuring out whether that's gasoline-compatible, and then I had brief flashes of dire warnings from high school chemistry posters, and then I thought "Hey, I bet if there's a simple answer, GRM knows what it is!"

Could both purposes be served by one of these little squeezy dispenser cans?

HF link

Wash bottle?

I keep a stack of these handy. They are useful for all kinds of liquids and have the advantage of graduated markings. I keep 8 oz, 20oz, and gallon sizes on the shelf. 

Edit to say, I keep several of these around as well. Also useful for many things like sucking a master cylinder dry, or flushing passages. 

Karacticus said:

Wash bottle?

Wash bottle, 100%.

I prefer the kind that the spout isnt in the lid.  https://a.co/d/7nyarrB

Plus, then you feel like a scientist!

I also like the wash bottle.

Probably too expensive unless you buy on at a yard sale ....

But how about a portable boat tank that has a Fuel Line w/ Primer Bulb  ?

In a pinch I've used a soda bottle and threaded a barbed fitting into the cap, then kept it higher than the carb with a hose.  It worked and was basically free. 

 Ketchup & mustard bottles at the dollar store.

Wash bottle and label appropriately. 

Go big or go home. 

I have used the gas tank off one of my motorcycles before.