First you need
1 tub (pound shop)
1 plastic bin (pound shop)
1 fish bubble pump (Â£7 inc postage off ebay)
Some rubber tubing (hanging around - or could come with pump)
2 Cable ties
Hot glue gun
Red tape (blue might also do.... yellow may do but have problems - white tape cannot be used :-)
1 hour of spare time
1 sunny after noon in the conservatory (optional)
got all that stuff? lets bubble!
Step 1: Make the hole for the bubble tube
Heat the bottom with the lighter and make a hole this way: i have tried drilling this type of plastic before and it's pretty brittle... this is the safest... but the tubs are only a quid so knock yourself out.
Don't let the plastic burn though as it stinks and will make the hole too large.
When it is ply-able, stick a screw driver through the plastic to make a small hole (roughly the size of the tube). Be careful not to make it too big otherwise it'll be a lot of hassle trying to seal again!
The reason we are going through the bottom and not poking the pipe through the gaping hole at the top of the container, is so that the top can be sealed off with the container lid - for easier storage and transport - plus.. water tight sealing the bottom isnt that hard.