I too would suggest leaving the tablets in their protective bubble packaging. Actually, I use Micropur tablets and I tear them open with my fingers -- even when wet. If you have that much trouble, maybe cut a tiny notch at the periphery -- not to the bubble itself -- to ease tearing while in the field.

I would recommend against switching to liquid for these reasons:

1. requires tedious counting of droplets and an extra 5-minute pre-mix time
2. less potency than solids (solids have 3-4 times the active ingredient)
3. risk of spilling