Watering Tomatoes from below.

Another way is to cut the bottoms off 2 litre soda bottles and bury them, neck down, almost to the rims. Fill them everyday with water, and add feed as needed since the water won't be sitting.

we stood ours on a bed of gravel in the greenhouse, cut a big hole in bottom of pot to allow roots to get to water then water the gravel and feed from the top.

No!

If it's hot, they last me a day. In cooler weather every other day.

I've got my tomatoes in grow bags - some are in those double sleeved pots which fit into the growbags - you put water in the outer ring and diluted tomorite into the inner pot .  I've also got two grow bags  where I have cut two holes and fitted in plastic grids which you water through - I think I bought them in the garden centre.  In these bags I planted the tomatoes through cut off lengths of plastic drainpipe about 20cm or so in length.  The tomatoes were planted into the growbag soil and I then filled the drainpipes with compost, removing any small lower leaves where necessary.  In all the growbags, the minimum area of soil is exposed, so less evaporation and it is easier to water, especially the double sleeved pots though they are quite pricey so I only got enough for 6 plants. 

They've been growing outside (in open cold frames) until this weekend when I moved them into our new greenhouse.  Some of them have grown three inches in two days!  I have been watering them a lot but don't want to overdo it as it is difficult to tell if the compost in the bag is drying out - is it possible to water too much?  Is there a general  rule of thumb per plant per day? 

Also, should I now cut off the leaves below the first truss?  I have seen this advice on another website but would appreciate a second opinion.

Yeah, I think I've a moisture sensor somewhere (bought but never used  ) so I'd better check the grow bags.  Actually tomatoes are quite tricky aren't they - if you let them dry out and then water too much you get blossom end rot.  And last year I lost all mine (outdoor ones) to blight.  Never mind, I keep trying 

I will remove the lower leaves - thanks for that Ice

I have just purchased 3 trays from Crocus for £7.99 each, plus postage.  They are solid plastic and I am very pleased with them.  The price seemed high, but the quality is good and they will last for years.
Here is the link
 
http://www.crocus.co.uk/product/_/product/plastic-pots/pots-&-containers/saucers/growbags/classid.2000007885/
 

I agree with Ice,  careful not to over water
I water mine when they need it, every day
in hot sun (ha ha) every three days or so in dull
cloudy weather, like today, and feed 20ml of
tomarite to a can on every watering from the top.

Works for me