Home Made Washer Bottle

[MikeDrop]

Hi all,

I'm making a home made washer bottle for my car out of a mini water cooler style plastic canister. Looking for some advice on how I can:

• Make a hole that will fit the washer pump - ~ 4mm. I was thinking of using a soldering iron to melt the plastic?
• Make a hole to locate the low level sensor ~ 30mm. Was going to use a hole saw or a flat wood drill bit.
• What to use so that they can be held securely in their holes without leaking, but is not permanently bonded. Will a hot glue gun do the trick, or will that be too weak?

Pic of the bottle I'm using